Linear Algebra Examples

⎡ ⎢ ⎣ \begin{matrix} \frac{1}{\sqrt{5}} & - \frac{14}{\sqrt{205}} \frac{2}{\sqrt{5}} & - \frac{3}{\sqrt{205}} \end{matrix} ⎤ ⎥ ⎦

$[\begin{array}{c} \frac{1}{\sqrt{5}} & - \frac{14}{\sqrt{205}} \\ \frac{2}{\sqrt{5}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 1

Multiply

$\frac{1}{\sqrt{5}}$ by

$\frac{\sqrt{5}}{\sqrt{5}}$ .

$[\begin{array}{c} \frac{1}{\sqrt{5}} \cdot \frac{\sqrt{5}}{\sqrt{5}} & - \frac{14}{\sqrt{205}} \\ \frac{2}{\sqrt{5}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 2

Combine and simplify the denominator.

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Step 2.1

Multiply

$\frac{1}{\sqrt{5}}$ by

$\frac{\sqrt{5}}{\sqrt{5}}$ .

$[\begin{array}{c} \frac{\sqrt{5}}{\sqrt{5} \sqrt{5}} & - \frac{14}{\sqrt{205}} \\ \frac{2}{\sqrt{5}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 2.2

Raise

$\sqrt{5}$ to the power of

$1$ .

$[\begin{array}{c} \frac{\sqrt{5}}{{\sqrt{5}}^{1} \sqrt{5}} & - \frac{14}{\sqrt{205}} \\ \frac{2}{\sqrt{5}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 2.3

Raise

$\sqrt{5}$ to the power of

$1$ .

$[\begin{array}{c} \frac{\sqrt{5}}{{\sqrt{5}}^{1} {\sqrt{5}}^{1}} & - \frac{14}{\sqrt{205}} \\ \frac{2}{\sqrt{5}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 2.4

Use the power rule

$a^{m} a^{n} = a^{m + n}$ to combine exponents.

$[\begin{array}{c} \frac{\sqrt{5}}{{\sqrt{5}}^{1 + 1}} & - \frac{14}{\sqrt{205}} \\ \frac{2}{\sqrt{5}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 2.5

Add

$1$ and

$1$ .

$[\begin{array}{c} \frac{\sqrt{5}}{{\sqrt{5}}^{2}} & - \frac{14}{\sqrt{205}} \\ \frac{2}{\sqrt{5}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 2.6

Rewrite

${\sqrt{5}}^{2}$ as

$5$ .

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Step 2.6.1

Use

$\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite

$\sqrt{5}$ as

$5^{\frac{1}{2}}$ .

$[\begin{array}{c} \frac{\sqrt{5}}{{(5^{\frac{1}{2}})}^{2}} & - \frac{14}{\sqrt{205}} \\ \frac{2}{\sqrt{5}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 2.6.2

Apply the power rule and multiply exponents,

${(a^{m})}^{n} = a^{m n}$ .

$[\begin{array}{c} \frac{\sqrt{5}}{5^{\frac{1}{2} \cdot 2}} & - \frac{14}{\sqrt{205}} \\ \frac{2}{\sqrt{5}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 2.6.3

Combine

$\frac{1}{2}$ and

$2$ .

$[\begin{array}{c} \frac{\sqrt{5}}{5^{\frac{2}{2}}} & - \frac{14}{\sqrt{205}} \\ \frac{2}{\sqrt{5}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 2.6.4

Cancel the common factor of

$2$ .

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Step 2.6.4.1

Cancel the common factor.

$[\begin{array}{c} \frac{\sqrt{5}}{5^{\frac{2}{2}}} & - \frac{14}{\sqrt{205}} \\ \frac{2}{\sqrt{5}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 2.6.4.2

Rewrite the expression.

$[\begin{array}{c} \frac{\sqrt{5}}{5^{1}} & - \frac{14}{\sqrt{205}} \\ \frac{2}{\sqrt{5}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 2.6.5

Evaluate the exponent.

$[\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14}{\sqrt{205}} \\ \frac{2}{\sqrt{5}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 3

Multiply

$\frac{14}{\sqrt{205}}$ by

$\frac{\sqrt{205}}{\sqrt{205}}$ .

$[\begin{array}{c} \frac{\sqrt{5}}{5} & - (\frac{14}{\sqrt{205}} \cdot \frac{\sqrt{205}}{\sqrt{205}}) \\ \frac{2}{\sqrt{5}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 4

Combine and simplify the denominator.

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Step 4.1

Multiply

$\frac{14}{\sqrt{205}}$ by

$\frac{\sqrt{205}}{\sqrt{205}}$ .

$[\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{\sqrt{205} \sqrt{205}} \\ \frac{2}{\sqrt{5}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 4.2

Raise

$\sqrt{205}$ to the power of

$1$ .

$[\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{{\sqrt{205}}^{1} \sqrt{205}} \\ \frac{2}{\sqrt{5}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 4.3

Raise

$\sqrt{205}$ to the power of

$1$ .

$[\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{{\sqrt{205}}^{1} {\sqrt{205}}^{1}} \\ \frac{2}{\sqrt{5}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 4.4

Use the power rule

$a^{m} a^{n} = a^{m + n}$ to combine exponents.

$[\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{{\sqrt{205}}^{1 + 1}} \\ \frac{2}{\sqrt{5}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 4.5

Add

$1$ and

$1$ .

$[\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{{\sqrt{205}}^{2}} \\ \frac{2}{\sqrt{5}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 4.6

Rewrite

${\sqrt{205}}^{2}$ as

$205$ .

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Step 4.6.1

Use

$\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite

$\sqrt{205}$ as

$205^{\frac{1}{2}}$ .

$[\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{{(205^{\frac{1}{2}})}^{2}} \\ \frac{2}{\sqrt{5}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 4.6.2

Apply the power rule and multiply exponents,

${(a^{m})}^{n} = a^{m n}$ .

$[\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{205^{\frac{1}{2} \cdot 2}} \\ \frac{2}{\sqrt{5}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 4.6.3

Combine

$\frac{1}{2}$ and

$2$ .

$[\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{205^{\frac{2}{2}}} \\ \frac{2}{\sqrt{5}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 4.6.4

Cancel the common factor of

$2$ .

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Step 4.6.4.1

Cancel the common factor.

$[\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{205^{\frac{2}{2}}} \\ \frac{2}{\sqrt{5}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 4.6.4.2

Rewrite the expression.

$[\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{205^{1}} \\ \frac{2}{\sqrt{5}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 4.6.5

Evaluate the exponent.

$[\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{205} \\ \frac{2}{\sqrt{5}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 5

Multiply

$\frac{2}{\sqrt{5}}$ by

$\frac{\sqrt{5}}{\sqrt{5}}$ .

$[\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{205} \\ \frac{2}{\sqrt{5}} \cdot \frac{\sqrt{5}}{\sqrt{5}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 6

Combine and simplify the denominator.

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Step 6.1

Multiply

$\frac{2}{\sqrt{5}}$ by

$\frac{\sqrt{5}}{\sqrt{5}}$ .

$[\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{205} \\ \frac{2 \sqrt{5}}{\sqrt{5} \sqrt{5}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 6.2

Raise

$\sqrt{5}$ to the power of

$1$ .

$[\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{205} \\ \frac{2 \sqrt{5}}{{\sqrt{5}}^{1} \sqrt{5}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 6.3

Raise

$\sqrt{5}$ to the power of

$1$ .

$[\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{205} \\ \frac{2 \sqrt{5}}{{\sqrt{5}}^{1} {\sqrt{5}}^{1}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 6.4

Use the power rule

$a^{m} a^{n} = a^{m + n}$ to combine exponents.

$[\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{205} \\ \frac{2 \sqrt{5}}{{\sqrt{5}}^{1 + 1}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 6.5

Add

$1$ and

$1$ .

$[\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{205} \\ \frac{2 \sqrt{5}}{{\sqrt{5}}^{2}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 6.6

Rewrite

${\sqrt{5}}^{2}$ as

$5$ .

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Step 6.6.1

Use

$\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite

$\sqrt{5}$ as

$5^{\frac{1}{2}}$ .

$[\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{205} \\ \frac{2 \sqrt{5}}{{(5^{\frac{1}{2}})}^{2}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 6.6.2

Apply the power rule and multiply exponents,

${(a^{m})}^{n} = a^{m n}$ .

$[\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{205} \\ \frac{2 \sqrt{5}}{5^{\frac{1}{2} \cdot 2}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 6.6.3

Combine

$\frac{1}{2}$ and

$2$ .

$[\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{205} \\ \frac{2 \sqrt{5}}{5^{\frac{2}{2}}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 6.6.4

Cancel the common factor of

$2$ .

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Step 6.6.4.1

Cancel the common factor.

$[\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{205} \\ \frac{2 \sqrt{5}}{5^{\frac{2}{2}}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 6.6.4.2

Rewrite the expression.

$[\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{205} \\ \frac{2 \sqrt{5}}{5^{1}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 6.6.5

Evaluate the exponent.

$[\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{205} \\ \frac{2 \sqrt{5}}{5} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 7

Multiply

$\frac{3}{\sqrt{205}}$ by

$\frac{\sqrt{205}}{\sqrt{205}}$ .

$[\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{205} \\ \frac{2 \sqrt{5}}{5} & - (\frac{3}{\sqrt{205}} \cdot \frac{\sqrt{205}}{\sqrt{205}}) \end{array}]$

Step 8

Combine and simplify the denominator.

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Step 8.1

Multiply

$\frac{3}{\sqrt{205}}$ by

$\frac{\sqrt{205}}{\sqrt{205}}$ .

$[\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{205} \\ \frac{2 \sqrt{5}}{5} & - \frac{3 \sqrt{205}}{\sqrt{205} \sqrt{205}} \end{array}]$

Step 8.2

Raise

$\sqrt{205}$ to the power of

$1$ .

$[\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{205} \\ \frac{2 \sqrt{5}}{5} & - \frac{3 \sqrt{205}}{{\sqrt{205}}^{1} \sqrt{205}} \end{array}]$

Step 8.3

Raise

$\sqrt{205}$ to the power of

$1$ .

$[\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{205} \\ \frac{2 \sqrt{5}}{5} & - \frac{3 \sqrt{205}}{{\sqrt{205}}^{1} {\sqrt{205}}^{1}} \end{array}]$

Step 8.4

Use the power rule

$a^{m} a^{n} = a^{m + n}$ to combine exponents.

$[\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{205} \\ \frac{2 \sqrt{5}}{5} & - \frac{3 \sqrt{205}}{{\sqrt{205}}^{1 + 1}} \end{array}]$

Step 8.5

Add

$1$ and

$1$ .

$[\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{205} \\ \frac{2 \sqrt{5}}{5} & - \frac{3 \sqrt{205}}{{\sqrt{205}}^{2}} \end{array}]$

Step 8.6

Rewrite

${\sqrt{205}}^{2}$ as

$205$ .

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Step 8.6.1

Use

$\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite

$\sqrt{205}$ as

$205^{\frac{1}{2}}$ .

$[\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{205} \\ \frac{2 \sqrt{5}}{5} & - \frac{3 \sqrt{205}}{{(205^{\frac{1}{2}})}^{2}} \end{array}]$

Step 8.6.2

Apply the power rule and multiply exponents,

${(a^{m})}^{n} = a^{m n}$ .

$[\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{205} \\ \frac{2 \sqrt{5}}{5} & - \frac{3 \sqrt{205}}{205^{\frac{1}{2} \cdot 2}} \end{array}]$

Step 8.6.3

Combine

$\frac{1}{2}$ and

$2$ .

$[\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{205} \\ \frac{2 \sqrt{5}}{5} & - \frac{3 \sqrt{205}}{205^{\frac{2}{2}}} \end{array}]$

Step 8.6.4

Cancel the common factor of

$2$ .

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Step 8.6.4.1

Cancel the common factor.

$[\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{205} \\ \frac{2 \sqrt{5}}{5} & - \frac{3 \sqrt{205}}{205^{\frac{2}{2}}} \end{array}]$

Step 8.6.4.2

Rewrite the expression.

$[\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{205} \\ \frac{2 \sqrt{5}}{5} & - \frac{3 \sqrt{205}}{205^{1}} \end{array}]$

Step 8.6.5

Evaluate the exponent.

$[\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{205} \\ \frac{2 \sqrt{5}}{5} & - \frac{3 \sqrt{205}}{205} \end{array}]$

Step 9

The inverse of a

$2 \times 2$ matrix can be found using the formula

$\frac{1}{a d - b c} [\begin{array}{c} d & - b \\ - c & a \end{array}]$ where

$a d - b c$ is the determinant.

Step 10

Find the determinant.

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Step 10.1

The determinant of a

$2 \times 2$ matrix can be found using the formula

$| \begin{array}{c} a & b \\ c & d \end{array} | = a d - c b$ .

$\frac{\sqrt{5}}{5} (- \frac{3 \sqrt{205}}{205}) - \frac{2 \sqrt{5}}{5} (- \frac{14 \sqrt{205}}{205})$

Step 10.2

Simplify the determinant.

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Step 10.2.1

Simplify each term.

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Step 10.2.1.1

Multiply

$\frac{\sqrt{5}}{5} (- \frac{3 \sqrt{205}}{205})$ .

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Step 10.2.1.1.1

Multiply

$\frac{\sqrt{5}}{5}$ by

$\frac{3 \sqrt{205}}{205}$ .

$- \frac{\sqrt{5} (3 \sqrt{205})}{5 \cdot 205} - \frac{2 \sqrt{5}}{5} (- \frac{14 \sqrt{205}}{205})$

Step 10.2.1.1.2

Combine using the product rule for radicals.

$- \frac{3 \sqrt{5 \cdot 205}}{5 \cdot 205} - \frac{2 \sqrt{5}}{5} (- \frac{14 \sqrt{205}}{205})$

Step 10.2.1.1.3

Multiply

$5$ by

$205$ .

$- \frac{3 \sqrt{1025}}{5 \cdot 205} - \frac{2 \sqrt{5}}{5} (- \frac{14 \sqrt{205}}{205})$

Step 10.2.1.1.4

Multiply

$5$ by

$205$ .

$- \frac{3 \sqrt{1025}}{1025} - \frac{2 \sqrt{5}}{5} (- \frac{14 \sqrt{205}}{205})$

Step 10.2.1.2

Simplify the numerator.

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Step 10.2.1.2.1

Rewrite

$1025$ as

$5^{2} \cdot 41$ .

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Step 10.2.1.2.1.1

Factor

$25$ out of

$1025$ .

$- \frac{3 \sqrt{25 (41)}}{1025} - \frac{2 \sqrt{5}}{5} (- \frac{14 \sqrt{205}}{205})$

Step 10.2.1.2.1.2

Rewrite

$25$ as

$5^{2}$ .

$- \frac{3 \sqrt{5^{2} \cdot 41}}{1025} - \frac{2 \sqrt{5}}{5} (- \frac{14 \sqrt{205}}{205})$

Step 10.2.1.2.2

Pull terms out from under the radical.

$- \frac{3 \cdot 5 \sqrt{41}}{1025} - \frac{2 \sqrt{5}}{5} (- \frac{14 \sqrt{205}}{205})$

Step 10.2.1.2.3

Multiply

$3$ by

$5$ .

$- \frac{15 \sqrt{41}}{1025} - \frac{2 \sqrt{5}}{5} (- \frac{14 \sqrt{205}}{205})$

Step 10.2.1.3

Cancel the common factor of

$15$ and

$1025$ .

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Step 10.2.1.3.1

Factor

$5$ out of

$15 \sqrt{41}$ .

$- \frac{5 (3 \sqrt{41})}{1025} - \frac{2 \sqrt{5}}{5} (- \frac{14 \sqrt{205}}{205})$

Step 10.2.1.3.2

Cancel the common factors.

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Step 10.2.1.3.2.1

Factor

$5$ out of

$1025$ .

$- \frac{5 (3 \sqrt{41})}{5 (205)} - \frac{2 \sqrt{5}}{5} (- \frac{14 \sqrt{205}}{205})$

Step 10.2.1.3.2.2

Cancel the common factor.

$- \frac{5 (3 \sqrt{41})}{5 \cdot 205} - \frac{2 \sqrt{5}}{5} (- \frac{14 \sqrt{205}}{205})$

Step 10.2.1.3.2.3

Rewrite the expression.

$- \frac{3 \sqrt{41}}{205} - \frac{2 \sqrt{5}}{5} (- \frac{14 \sqrt{205}}{205})$

Step 10.2.1.4

Multiply

$- \frac{2 \sqrt{5}}{5} (- \frac{14 \sqrt{205}}{205})$ .

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Step 10.2.1.4.1

Multiply

$- 1$ by

$- 1$ .

$- \frac{3 \sqrt{41}}{205} + 1 \frac{2 \sqrt{5}}{5} \frac{14 \sqrt{205}}{205}$

Step 10.2.1.4.2

Multiply

$\frac{2 \sqrt{5}}{5}$ by

$1$ .

$- \frac{3 \sqrt{41}}{205} + \frac{2 \sqrt{5}}{5} \cdot \frac{14 \sqrt{205}}{205}$

Step 10.2.1.4.3

Multiply

$\frac{2 \sqrt{5}}{5}$ by

$\frac{14 \sqrt{205}}{205}$ .

$- \frac{3 \sqrt{41}}{205} + \frac{2 \sqrt{5} (14 \sqrt{205})}{5 \cdot 205}$

Step 10.2.1.4.4

Multiply

$14$ by

$2$ .

$- \frac{3 \sqrt{41}}{205} + \frac{28 \sqrt{5} \sqrt{205}}{5 \cdot 205}$

Step 10.2.1.4.5

Combine using the product rule for radicals.

$- \frac{3 \sqrt{41}}{205} + \frac{28 \sqrt{205 \cdot 5}}{5 \cdot 205}$

Step 10.2.1.4.6

Multiply

$205$ by

$5$ .

$- \frac{3 \sqrt{41}}{205} + \frac{28 \sqrt{1025}}{5 \cdot 205}$

Step 10.2.1.4.7

Multiply

$5$ by

$205$ .

$- \frac{3 \sqrt{41}}{205} + \frac{28 \sqrt{1025}}{1025}$

Step 10.2.1.5

Simplify the numerator.

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Step 10.2.1.5.1

Rewrite

$1025$ as

$5^{2} \cdot 41$ .

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Step 10.2.1.5.1.1

Factor

$25$ out of

$1025$ .

$- \frac{3 \sqrt{41}}{205} + \frac{28 \sqrt{25 (41)}}{1025}$

Step 10.2.1.5.1.2

Rewrite

$25$ as

$5^{2}$ .

$- \frac{3 \sqrt{41}}{205} + \frac{28 \sqrt{5^{2} \cdot 41}}{1025}$

Step 10.2.1.5.2

Pull terms out from under the radical.

$- \frac{3 \sqrt{41}}{205} + \frac{28 \cdot 5 \sqrt{41}}{1025}$

Step 10.2.1.5.3

Multiply

$28$ by

$5$ .

$- \frac{3 \sqrt{41}}{205} + \frac{140 \sqrt{41}}{1025}$

Step 10.2.1.6

Cancel the common factor of

$140$ and

$1025$ .

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Step 10.2.1.6.1

Factor

$5$ out of

$140 \sqrt{41}$ .

$- \frac{3 \sqrt{41}}{205} + \frac{5 (28 \sqrt{41})}{1025}$

Step 10.2.1.6.2

Cancel the common factors.

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Step 10.2.1.6.2.1

Factor

$5$ out of

$1025$ .

$- \frac{3 \sqrt{41}}{205} + \frac{5 (28 \sqrt{41})}{5 (205)}$

Step 10.2.1.6.2.2

Cancel the common factor.

$- \frac{3 \sqrt{41}}{205} + \frac{5 (28 \sqrt{41})}{5 \cdot 205}$

Step 10.2.1.6.2.3

Rewrite the expression.

$- \frac{3 \sqrt{41}}{205} + \frac{28 \sqrt{41}}{205}$

Step 10.2.2

Combine the numerators over the common denominator.

$\frac{- 3 \sqrt{41} + 28 \sqrt{41}}{205}$

Step 10.2.3

Add

$- 3 \sqrt{41}$ and

$28 \sqrt{41}$ .

$\frac{25 \sqrt{41}}{205}$

Step 10.2.4

Cancel the common factor of

$25$ and

$205$ .

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Step 10.2.4.1

Factor

$5$ out of

$25 \sqrt{41}$ .

$\frac{5 (5 \sqrt{41})}{205}$

Step 10.2.4.2

Cancel the common factors.

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Step 10.2.4.2.1

Factor

$5$ out of

$205$ .

$\frac{5 (5 \sqrt{41})}{5 (41)}$

Step 10.2.4.2.2

Cancel the common factor.

$\frac{5 (5 \sqrt{41})}{5 \cdot 41}$

Step 10.2.4.2.3

Rewrite the expression.

$\frac{5 \sqrt{41}}{41}$

Step 11

Since the determinant is non-zero, the inverse exists.

Step 12

Substitute the known values into the formula for the inverse.

$\frac{1}{\frac{5 \sqrt{41}}{41}} [\begin{array}{c} - \frac{3 \sqrt{205}}{205} & \frac{14 \sqrt{205}}{205} \\ - \frac{2 \sqrt{5}}{5} & \frac{\sqrt{5}}{5} \end{array}]$

Step 13

Multiply the numerator by the reciprocal of the denominator.

$1 \frac{41}{5 \sqrt{41}} [\begin{array}{c} - \frac{3 \sqrt{205}}{205} & \frac{14 \sqrt{205}}{205} \\ - \frac{2 \sqrt{5}}{5} & \frac{\sqrt{5}}{5} \end{array}]$

Step 14

Multiply

$\frac{41}{5 \sqrt{41}}$ by

$1$ .

$\frac{41}{5 \sqrt{41}} [\begin{array}{c} - \frac{3 \sqrt{205}}{205} & \frac{14 \sqrt{205}}{205} \\ - \frac{2 \sqrt{5}}{5} & \frac{\sqrt{5}}{5} \end{array}]$

Step 15

Multiply

$\frac{41}{5 \sqrt{41}}$ by

$\frac{\sqrt{41}}{\sqrt{41}}$ .

$\frac{41}{5 \sqrt{41}} \cdot \frac{\sqrt{41}}{\sqrt{41}} [\begin{array}{c} - \frac{3 \sqrt{205}}{205} & \frac{14 \sqrt{205}}{205} \\ - \frac{2 \sqrt{5}}{5} & \frac{\sqrt{5}}{5} \end{array}]$

Step 16

Combine and simplify the denominator.

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Step 16.1

Multiply

$\frac{41}{5 \sqrt{41}}$ by

$\frac{\sqrt{41}}{\sqrt{41}}$ .

$\frac{41 \sqrt{41}}{5 \sqrt{41} \sqrt{41}} [\begin{array}{c} - \frac{3 \sqrt{205}}{205} & \frac{14 \sqrt{205}}{205} \\ - \frac{2 \sqrt{5}}{5} & \frac{\sqrt{5}}{5} \end{array}]$

Step 16.2

Move

$\sqrt{41}$ .

$\frac{41 \sqrt{41}}{5 (\sqrt{41} \sqrt{41})} [\begin{array}{c} - \frac{3 \sqrt{205}}{205} & \frac{14 \sqrt{205}}{205} \\ - \frac{2 \sqrt{5}}{5} & \frac{\sqrt{5}}{5} \end{array}]$

Step 16.3

Raise

$\sqrt{41}$ to the power of

$1$ .

$\frac{41 \sqrt{41}}{5 ({\sqrt{41}}^{1} \sqrt{41})} [\begin{array}{c} - \frac{3 \sqrt{205}}{205} & \frac{14 \sqrt{205}}{205} \\ - \frac{2 \sqrt{5}}{5} & \frac{\sqrt{5}}{5} \end{array}]$

Step 16.4

Raise

$\sqrt{41}$ to the power of

$1$ .

$\frac{41 \sqrt{41}}{5 ({\sqrt{41}}^{1} {\sqrt{41}}^{1})} [\begin{array}{c} - \frac{3 \sqrt{205}}{205} & \frac{14 \sqrt{205}}{205} \\ - \frac{2 \sqrt{5}}{5} & \frac{\sqrt{5}}{5} \end{array}]$

Step 16.5

Use the power rule

$a^{m} a^{n} = a^{m + n}$ to combine exponents.

$\frac{41 \sqrt{41}}{5 {\sqrt{41}}^{1 + 1}} [\begin{array}{c} - \frac{3 \sqrt{205}}{205} & \frac{14 \sqrt{205}}{205} \\ - \frac{2 \sqrt{5}}{5} & \frac{\sqrt{5}}{5} \end{array}]$

Step 16.6

Add

$1$ and

$1$ .

$\frac{41 \sqrt{41}}{5 {\sqrt{41}}^{2}} [\begin{array}{c} - \frac{3 \sqrt{205}}{205} & \frac{14 \sqrt{205}}{205} \\ - \frac{2 \sqrt{5}}{5} & \frac{\sqrt{5}}{5} \end{array}]$

Step 16.7

Rewrite

${\sqrt{41}}^{2}$ as

$41$ .

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Step 16.7.1

Use

$\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite

$\sqrt{41}$ as

$41^{\frac{1}{2}}$ .

$\frac{41 \sqrt{41}}{5 {(41^{\frac{1}{2}})}^{2}} [\begin{array}{c} - \frac{3 \sqrt{205}}{205} & \frac{14 \sqrt{205}}{205} \\ - \frac{2 \sqrt{5}}{5} & \frac{\sqrt{5}}{5} \end{array}]$

Step 16.7.2

Apply the power rule and multiply exponents,

${(a^{m})}^{n} = a^{m n}$ .

$\frac{41 \sqrt{41}}{5 \cdot 41^{\frac{1}{2} \cdot 2}} [\begin{array}{c} - \frac{3 \sqrt{205}}{205} & \frac{14 \sqrt{205}}{205} \\ - \frac{2 \sqrt{5}}{5} & \frac{\sqrt{5}}{5} \end{array}]$

Step 16.7.3

Combine

$\frac{1}{2}$ and

$2$ .

$\frac{41 \sqrt{41}}{5 \cdot 41^{\frac{2}{2}}} [\begin{array}{c} - \frac{3 \sqrt{205}}{205} & \frac{14 \sqrt{205}}{205} \\ - \frac{2 \sqrt{5}}{5} & \frac{\sqrt{5}}{5} \end{array}]$

Step 16.7.4

Cancel the common factor of

$2$ .

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Step 16.7.4.1

Cancel the common factor.

$\frac{41 \sqrt{41}}{5 \cdot 41^{\frac{2}{2}}} [\begin{array}{c} - \frac{3 \sqrt{205}}{205} & \frac{14 \sqrt{205}}{205} \\ - \frac{2 \sqrt{5}}{5} & \frac{\sqrt{5}}{5} \end{array}]$

Step 16.7.4.2

Rewrite the expression.

$\frac{41 \sqrt{41}}{5 \cdot 41^{1}} [\begin{array}{c} - \frac{3 \sqrt{205}}{205} & \frac{14 \sqrt{205}}{205} \\ - \frac{2 \sqrt{5}}{5} & \frac{\sqrt{5}}{5} \end{array}]$

Step 16.7.5

Evaluate the exponent.

$\frac{41 \sqrt{41}}{5 \cdot 41} [\begin{array}{c} - \frac{3 \sqrt{205}}{205} & \frac{14 \sqrt{205}}{205} \\ - \frac{2 \sqrt{5}}{5} & \frac{\sqrt{5}}{5} \end{array}]$

Step 17

Cancel the common factor of

$41$ .

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Step 17.1

Cancel the common factor.

$\frac{41 \sqrt{41}}{5 \cdot 41} [\begin{array}{c} - \frac{3 \sqrt{205}}{205} & \frac{14 \sqrt{205}}{205} \\ - \frac{2 \sqrt{5}}{5} & \frac{\sqrt{5}}{5} \end{array}]$

Step 17.2

Rewrite the expression.

$\frac{\sqrt{41}}{5} [\begin{array}{c} - \frac{3 \sqrt{205}}{205} & \frac{14 \sqrt{205}}{205} \\ - \frac{2 \sqrt{5}}{5} & \frac{\sqrt{5}}{5} \end{array}]$

Step 18

Multiply

$\frac{\sqrt{41}}{5}$ by each element of the matrix.

$[\begin{array}{c} \frac{\sqrt{41}}{5} (- \frac{3 \sqrt{205}}{205}) & \frac{\sqrt{41}}{5} \cdot \frac{14 \sqrt{205}}{205} \\ \frac{\sqrt{41}}{5} (- \frac{2 \sqrt{5}}{5}) & \frac{\sqrt{41}}{5} \cdot \frac{\sqrt{5}}{5} \end{array}]$

Step 19

Simplify each element in the matrix.

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Step 19.1

Multiply

$\frac{\sqrt{41}}{5} (- \frac{3 \sqrt{205}}{205})$ .

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Step 19.1.1

Multiply

$\frac{\sqrt{41}}{5}$ by

$\frac{3 \sqrt{205}}{205}$ .

$[\begin{array}{c} - \frac{\sqrt{41} (3 \sqrt{205})}{5 \cdot 205} & \frac{\sqrt{41}}{5} \cdot \frac{14 \sqrt{205}}{205} \\ \frac{\sqrt{41}}{5} (- \frac{2 \sqrt{5}}{5}) & \frac{\sqrt{41}}{5} \cdot \frac{\sqrt{5}}{5} \end{array}]$

Step 19.1.2

Combine using the product rule for radicals.

$[\begin{array}{c} - \frac{3 \sqrt{41 \cdot 205}}{5 \cdot 205} & \frac{\sqrt{41}}{5} \cdot \frac{14 \sqrt{205}}{205} \\ \frac{\sqrt{41}}{5} (- \frac{2 \sqrt{5}}{5}) & \frac{\sqrt{41}}{5} \cdot \frac{\sqrt{5}}{5} \end{array}]$

Step 19.1.3

Multiply

$41$ by

$205$ .

$[\begin{array}{c} - \frac{3 \sqrt{8405}}{5 \cdot 205} & \frac{\sqrt{41}}{5} \cdot \frac{14 \sqrt{205}}{205} \\ \frac{\sqrt{41}}{5} (- \frac{2 \sqrt{5}}{5}) & \frac{\sqrt{41}}{5} \cdot \frac{\sqrt{5}}{5} \end{array}]$

Step 19.1.4

Multiply

$5$ by

$205$ .

$[\begin{array}{c} - \frac{3 \sqrt{8405}}{1025} & \frac{\sqrt{41}}{5} \cdot \frac{14 \sqrt{205}}{205} \\ \frac{\sqrt{41}}{5} (- \frac{2 \sqrt{5}}{5}) & \frac{\sqrt{41}}{5} \cdot \frac{\sqrt{5}}{5} \end{array}]$

Step 19.2

Simplify the numerator.

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Step 19.2.1

Rewrite

$8405$ as

$41^{2} \cdot 5$ .

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Step 19.2.1.1

Factor

$1681$ out of

$8405$ .

$[\begin{array}{c} - \frac{3 \sqrt{1681 (5)}}{1025} & \frac{\sqrt{41}}{5} \cdot \frac{14 \sqrt{205}}{205} \\ \frac{\sqrt{41}}{5} (- \frac{2 \sqrt{5}}{5}) & \frac{\sqrt{41}}{5} \cdot \frac{\sqrt{5}}{5} \end{array}]$

Step 19.2.1.2

Rewrite

$1681$ as

$41^{2}$ .

$[\begin{array}{c} - \frac{3 \sqrt{41^{2} \cdot 5}}{1025} & \frac{\sqrt{41}}{5} \cdot \frac{14 \sqrt{205}}{205} \\ \frac{\sqrt{41}}{5} (- \frac{2 \sqrt{5}}{5}) & \frac{\sqrt{41}}{5} \cdot \frac{\sqrt{5}}{5} \end{array}]$

Step 19.2.2

Pull terms out from under the radical.

$[\begin{array}{c} - \frac{3 \cdot 41 \sqrt{5}}{1025} & \frac{\sqrt{41}}{5} \cdot \frac{14 \sqrt{205}}{205} \\ \frac{\sqrt{41}}{5} (- \frac{2 \sqrt{5}}{5}) & \frac{\sqrt{41}}{5} \cdot \frac{\sqrt{5}}{5} \end{array}]$

Step 19.2.3

Multiply

$3$ by

$41$ .

$[\begin{array}{c} - \frac{123 \sqrt{5}}{1025} & \frac{\sqrt{41}}{5} \cdot \frac{14 \sqrt{205}}{205} \\ \frac{\sqrt{41}}{5} (- \frac{2 \sqrt{5}}{5}) & \frac{\sqrt{41}}{5} \cdot \frac{\sqrt{5}}{5} \end{array}]$

Step 19.3

Cancel the common factor of

$123$ and

$1025$ .

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Step 19.3.1

Factor

$41$ out of

$123 \sqrt{5}$ .

$[\begin{array}{c} - \frac{41 (3 \sqrt{5})}{1025} & \frac{\sqrt{41}}{5} \cdot \frac{14 \sqrt{205}}{205} \\ \frac{\sqrt{41}}{5} (- \frac{2 \sqrt{5}}{5}) & \frac{\sqrt{41}}{5} \cdot \frac{\sqrt{5}}{5} \end{array}]$

Step 19.3.2

Cancel the common factors.

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Step 19.3.2.1

Factor

$41$ out of

$1025$ .

$[\begin{array}{c} - \frac{41 (3 \sqrt{5})}{41 (25)} & \frac{\sqrt{41}}{5} \cdot \frac{14 \sqrt{205}}{205} \\ \frac{\sqrt{41}}{5} (- \frac{2 \sqrt{5}}{5}) & \frac{\sqrt{41}}{5} \cdot \frac{\sqrt{5}}{5} \end{array}]$

Step 19.3.2.2

Cancel the common factor.

$[\begin{array}{c} - \frac{41 (3 \sqrt{5})}{41 \cdot 25} & \frac{\sqrt{41}}{5} \cdot \frac{14 \sqrt{205}}{205} \\ \frac{\sqrt{41}}{5} (- \frac{2 \sqrt{5}}{5}) & \frac{\sqrt{41}}{5} \cdot \frac{\sqrt{5}}{5} \end{array}]$

Step 19.3.2.3

Rewrite the expression.

$[\begin{array}{c} - \frac{3 \sqrt{5}}{25} & \frac{\sqrt{41}}{5} \cdot \frac{14 \sqrt{205}}{205} \\ \frac{\sqrt{41}}{5} (- \frac{2 \sqrt{5}}{5}) & \frac{\sqrt{41}}{5} \cdot \frac{\sqrt{5}}{5} \end{array}]$

Step 19.4

Multiply

$\frac{\sqrt{41}}{5} \cdot \frac{14 \sqrt{205}}{205}$ .

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Step 19.4.1

Multiply

$\frac{\sqrt{41}}{5}$ by

$\frac{14 \sqrt{205}}{205}$ .

$[\begin{array}{c} - \frac{3 \sqrt{5}}{25} & \frac{\sqrt{41} (14 \sqrt{205})}{5 \cdot 205} \\ \frac{\sqrt{41}}{5} (- \frac{2 \sqrt{5}}{5}) & \frac{\sqrt{41}}{5} \cdot \frac{\sqrt{5}}{5} \end{array}]$

Step 19.4.2

Combine using the product rule for radicals.

$[\begin{array}{c} - \frac{3 \sqrt{5}}{25} & \frac{14 \sqrt{41 \cdot 205}}{5 \cdot 205} \\ \frac{\sqrt{41}}{5} (- \frac{2 \sqrt{5}}{5}) & \frac{\sqrt{41}}{5} \cdot \frac{\sqrt{5}}{5} \end{array}]$

Step 19.4.3

Multiply

$41$ by

$205$ .

$[\begin{array}{c} - \frac{3 \sqrt{5}}{25} & \frac{14 \sqrt{8405}}{5 \cdot 205} \\ \frac{\sqrt{41}}{5} (- \frac{2 \sqrt{5}}{5}) & \frac{\sqrt{41}}{5} \cdot \frac{\sqrt{5}}{5} \end{array}]$

Step 19.4.4

Multiply

$5$ by

$205$ .

$[\begin{array}{c} - \frac{3 \sqrt{5}}{25} & \frac{14 \sqrt{8405}}{1025} \\ \frac{\sqrt{41}}{5} (- \frac{2 \sqrt{5}}{5}) & \frac{\sqrt{41}}{5} \cdot \frac{\sqrt{5}}{5} \end{array}]$

Step 19.5

Simplify the numerator.

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Step 19.5.1

Rewrite

$8405$ as

$41^{2} \cdot 5$ .

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Step 19.5.1.1

Factor

$1681$ out of

$8405$ .

$[\begin{array}{c} - \frac{3 \sqrt{5}}{25} & \frac{14 \sqrt{1681 (5)}}{1025} \\ \frac{\sqrt{41}}{5} (- \frac{2 \sqrt{5}}{5}) & \frac{\sqrt{41}}{5} \cdot \frac{\sqrt{5}}{5} \end{array}]$

Step 19.5.1.2

Rewrite

$1681$ as

$41^{2}$ .

$[\begin{array}{c} - \frac{3 \sqrt{5}}{25} & \frac{14 \sqrt{41^{2} \cdot 5}}{1025} \\ \frac{\sqrt{41}}{5} (- \frac{2 \sqrt{5}}{5}) & \frac{\sqrt{41}}{5} \cdot \frac{\sqrt{5}}{5} \end{array}]$

Step 19.5.2

Pull terms out from under the radical.

$[\begin{array}{c} - \frac{3 \sqrt{5}}{25} & \frac{14 \cdot 41 \sqrt{5}}{1025} \\ \frac{\sqrt{41}}{5} (- \frac{2 \sqrt{5}}{5}) & \frac{\sqrt{41}}{5} \cdot \frac{\sqrt{5}}{5} \end{array}]$

Step 19.5.3

Multiply

$14$ by

$41$ .

$[\begin{array}{c} - \frac{3 \sqrt{5}}{25} & \frac{574 \sqrt{5}}{1025} \\ \frac{\sqrt{41}}{5} (- \frac{2 \sqrt{5}}{5}) & \frac{\sqrt{41}}{5} \cdot \frac{\sqrt{5}}{5} \end{array}]$

Step 19.6

Cancel the common factor of

$574$ and

$1025$ .

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Step 19.6.1

Factor

$41$ out of

$574 \sqrt{5}$ .

$[\begin{array}{c} - \frac{3 \sqrt{5}}{25} & \frac{41 (14 \sqrt{5})}{1025} \\ \frac{\sqrt{41}}{5} (- \frac{2 \sqrt{5}}{5}) & \frac{\sqrt{41}}{5} \cdot \frac{\sqrt{5}}{5} \end{array}]$

Step 19.6.2

Cancel the common factors.

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Step 19.6.2.1

Factor

$41$ out of

$1025$ .

$[\begin{array}{c} - \frac{3 \sqrt{5}}{25} & \frac{41 (14 \sqrt{5})}{41 (25)} \\ \frac{\sqrt{41}}{5} (- \frac{2 \sqrt{5}}{5}) & \frac{\sqrt{41}}{5} \cdot \frac{\sqrt{5}}{5} \end{array}]$

Step 19.6.2.2

Cancel the common factor.

$[\begin{array}{c} - \frac{3 \sqrt{5}}{25} & \frac{41 (14 \sqrt{5})}{41 \cdot 25} \\ \frac{\sqrt{41}}{5} (- \frac{2 \sqrt{5}}{5}) & \frac{\sqrt{41}}{5} \cdot \frac{\sqrt{5}}{5} \end{array}]$

Step 19.6.2.3

Rewrite the expression.

$[\begin{array}{c} - \frac{3 \sqrt{5}}{25} & \frac{14 \sqrt{5}}{25} \\ \frac{\sqrt{41}}{5} (- \frac{2 \sqrt{5}}{5}) & \frac{\sqrt{41}}{5} \cdot \frac{\sqrt{5}}{5} \end{array}]$

Step 19.7

Multiply

$\frac{\sqrt{41}}{5} (- \frac{2 \sqrt{5}}{5})$ .

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Step 19.7.1

Multiply

$\frac{\sqrt{41}}{5}$ by

$\frac{2 \sqrt{5}}{5}$ .

$[\begin{array}{c} - \frac{3 \sqrt{5}}{25} & \frac{14 \sqrt{5}}{25} \\ - \frac{\sqrt{41} (2 \sqrt{5})}{5 \cdot 5} & \frac{\sqrt{41}}{5} \cdot \frac{\sqrt{5}}{5} \end{array}]$

Step 19.7.2

Combine using the product rule for radicals.

$[\begin{array}{c} - \frac{3 \sqrt{5}}{25} & \frac{14 \sqrt{5}}{25} \\ - \frac{2 \sqrt{41 \cdot 5}}{5 \cdot 5} & \frac{\sqrt{41}}{5} \cdot \frac{\sqrt{5}}{5} \end{array}]$

Step 19.7.3

Multiply

$41$ by

$5$ .

$[\begin{array}{c} - \frac{3 \sqrt{5}}{25} & \frac{14 \sqrt{5}}{25} \\ - \frac{2 \sqrt{205}}{5 \cdot 5} & \frac{\sqrt{41}}{5} \cdot \frac{\sqrt{5}}{5} \end{array}]$

Step 19.7.4

Multiply

$5$ by

$5$ .

$[\begin{array}{c} - \frac{3 \sqrt{5}}{25} & \frac{14 \sqrt{5}}{25} \\ - \frac{2 \sqrt{205}}{25} & \frac{\sqrt{41}}{5} \cdot \frac{\sqrt{5}}{5} \end{array}]$

Step 19.8

Multiply

$\frac{\sqrt{41}}{5} \cdot \frac{\sqrt{5}}{5}$ .

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Step 19.8.1

Multiply

$\frac{\sqrt{41}}{5}$ by

$\frac{\sqrt{5}}{5}$ .

$[\begin{array}{c} - \frac{3 \sqrt{5}}{25} & \frac{14 \sqrt{5}}{25} \\ - \frac{2 \sqrt{205}}{25} & \frac{\sqrt{41} \sqrt{5}}{5 \cdot 5} \end{array}]$

Step 19.8.2

Combine using the product rule for radicals.

$[\begin{array}{c} - \frac{3 \sqrt{5}}{25} & \frac{14 \sqrt{5}}{25} \\ - \frac{2 \sqrt{205}}{25} & \frac{\sqrt{41 \cdot 5}}{5 \cdot 5} \end{array}]$

Step 19.8.3

Multiply

$41$ by

$5$ .

$[\begin{array}{c} - \frac{3 \sqrt{5}}{25} & \frac{14 \sqrt{5}}{25} \\ - \frac{2 \sqrt{205}}{25} & \frac{\sqrt{205}}{5 \cdot 5} \end{array}]$

Step 19.8.4

Multiply

$5$ by

$5$ .

$[\begin{array}{c} - \frac{3 \sqrt{5}}{25} & \frac{14 \sqrt{5}}{25} \\ - \frac{2 \sqrt{205}}{25} & \frac{\sqrt{205}}{25} \end{array}]$