Linear Algebra Examples

$[\begin{array}{c} \frac{- 3 \sqrt{5}}{25} & \frac{14 \sqrt{5}}{25} \\ \frac{- 2 \sqrt{205}}{25} & \frac{\sqrt{205}}{25} \end{array}] [\begin{array}{c} 0 & 2 \\ 2 & 3 \end{array}] [\begin{array}{c} \frac{1}{\sqrt{5}} & - \frac{14}{\sqrt{205}} \\ \frac{2}{\sqrt{5}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 1

Move the negative in front of the fraction.

$[\begin{array}{c} - \frac{3 \sqrt{5}}{25} & \frac{14 \sqrt{5}}{25} \\ \frac{- 2 \sqrt{205}}{25} & \frac{\sqrt{205}}{25} \end{array}] [\begin{array}{c} 0 & 2 \\ 2 & 3 \end{array}] [\begin{array}{c} \frac{1}{\sqrt{5}} & - \frac{14}{\sqrt{205}} \\ \frac{2}{\sqrt{5}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 2

Move the negative in front of the fraction.

$[\begin{array}{c} - \frac{3 \sqrt{5}}{25} & \frac{14 \sqrt{5}}{25} \\ - \frac{2 \sqrt{205}}{25} & \frac{\sqrt{205}}{25} \end{array}] [\begin{array}{c} 0 & 2 \\ 2 & 3 \end{array}] [\begin{array}{c} \frac{1}{\sqrt{5}} & - \frac{14}{\sqrt{205}} \\ \frac{2}{\sqrt{5}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 3

Multiply $[\begin{array}{c} - \frac{3 \sqrt{5}}{25} & \frac{14 \sqrt{5}}{25} \\ - \frac{2 \sqrt{205}}{25} & \frac{\sqrt{205}}{25} \end{array}] [\begin{array}{c} 0 & 2 \\ 2 & 3 \end{array}]$ .

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Step 3.1

Two matrices can be multiplied if and only if the number of columns in the first matrix is equal to the number of rows in the second matrix. In this case, the first matrix is $2 \times 2$ and the second matrix is $2 \times 2$ .

Step 3.2

Multiply each row in the first matrix by each column in the second matrix.

$[\begin{array}{c} - \frac{3 \sqrt{5}}{25} \cdot 0 + \frac{14 \sqrt{5}}{25} \cdot 2 & - \frac{3 \sqrt{5}}{25} \cdot 2 + \frac{14 \sqrt{5}}{25} \cdot 3 \\ - \frac{2 \sqrt{205}}{25} \cdot 0 + \frac{\sqrt{205}}{25} \cdot 2 & - \frac{2 \sqrt{205}}{25} \cdot 2 + \frac{\sqrt{205}}{25} \cdot 3 \end{array}] [\begin{array}{c} \frac{1}{\sqrt{5}} & - \frac{14}{\sqrt{205}} \\ \frac{2}{\sqrt{5}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 3.3

Simplify each element of the matrix by multiplying out all the expressions.

$[\begin{array}{c} \frac{28 \sqrt{5}}{25} & \frac{36 \sqrt{5}}{25} \\ \frac{2 \sqrt{205}}{25} & - \frac{\sqrt{205}}{25} \end{array}] [\begin{array}{c} \frac{1}{\sqrt{5}} & - \frac{14}{\sqrt{205}} \\ \frac{2}{\sqrt{5}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 4

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

$[\begin{array}{c} \frac{28 \sqrt{5}}{25} & \frac{36 \sqrt{5}}{25} \\ \frac{2 \sqrt{205}}{25} & - \frac{\sqrt{205}}{25} \end{array}] [\begin{array}{c} \frac{1}{\sqrt{5}} \cdot \frac{\sqrt{5}}{\sqrt{5}} & - \frac{14}{\sqrt{205}} \\ \frac{2}{\sqrt{5}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 5

Combine and simplify the denominator.

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Step 5.1

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

$[\begin{array}{c} \frac{28 \sqrt{5}}{25} & \frac{36 \sqrt{5}}{25} \\ \frac{2 \sqrt{205}}{25} & - \frac{\sqrt{205}}{25} \end{array}] [\begin{array}{c} \frac{\sqrt{5}}{\sqrt{5} \sqrt{5}} & - \frac{14}{\sqrt{205}} \\ \frac{2}{\sqrt{5}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 5.2

Raise $\sqrt{5}$ to the power of $1$ .

$[\begin{array}{c} \frac{28 \sqrt{5}}{25} & \frac{36 \sqrt{5}}{25} \\ \frac{2 \sqrt{205}}{25} & - \frac{\sqrt{205}}{25} \end{array}] [\begin{array}{c} \frac{\sqrt{5}}{{\sqrt{5}}^{1} \sqrt{5}} & - \frac{14}{\sqrt{205}} \\ \frac{2}{\sqrt{5}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 5.3

Raise $\sqrt{5}$ to the power of $1$ .

$[\begin{array}{c} \frac{28 \sqrt{5}}{25} & \frac{36 \sqrt{5}}{25} \\ \frac{2 \sqrt{205}}{25} & - \frac{\sqrt{205}}{25} \end{array}] [\begin{array}{c} \frac{\sqrt{5}}{{\sqrt{5}}^{1} {\sqrt{5}}^{1}} & - \frac{14}{\sqrt{205}} \\ \frac{2}{\sqrt{5}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 5.4

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$[\begin{array}{c} \frac{28 \sqrt{5}}{25} & \frac{36 \sqrt{5}}{25} \\ \frac{2 \sqrt{205}}{25} & - \frac{\sqrt{205}}{25} \end{array}] [\begin{array}{c} \frac{\sqrt{5}}{{\sqrt{5}}^{1 + 1}} & - \frac{14}{\sqrt{205}} \\ \frac{2}{\sqrt{5}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 5.5

Add $1$ and $1$ .

$[\begin{array}{c} \frac{28 \sqrt{5}}{25} & \frac{36 \sqrt{5}}{25} \\ \frac{2 \sqrt{205}}{25} & - \frac{\sqrt{205}}{25} \end{array}] [\begin{array}{c} \frac{\sqrt{5}}{{\sqrt{5}}^{2}} & - \frac{14}{\sqrt{205}} \\ \frac{2}{\sqrt{5}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 5.6

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

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Step 5.6.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{5}$ as $5^{\frac{1}{2}}$ .

$[\begin{array}{c} \frac{28 \sqrt{5}}{25} & \frac{36 \sqrt{5}}{25} \\ \frac{2 \sqrt{205}}{25} & - \frac{\sqrt{205}}{25} \end{array}] [\begin{array}{c} \frac{\sqrt{5}}{{(5^{\frac{1}{2}})}^{2}} & - \frac{14}{\sqrt{205}} \\ \frac{2}{\sqrt{5}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 5.6.2

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$[\begin{array}{c} \frac{28 \sqrt{5}}{25} & \frac{36 \sqrt{5}}{25} \\ \frac{2 \sqrt{205}}{25} & - \frac{\sqrt{205}}{25} \end{array}] [\begin{array}{c} \frac{\sqrt{5}}{5^{\frac{1}{2} \cdot 2}} & - \frac{14}{\sqrt{205}} \\ \frac{2}{\sqrt{5}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 5.6.3

Combine $\frac{1}{2}$ and $2$ .

$[\begin{array}{c} \frac{28 \sqrt{5}}{25} & \frac{36 \sqrt{5}}{25} \\ \frac{2 \sqrt{205}}{25} & - \frac{\sqrt{205}}{25} \end{array}] [\begin{array}{c} \frac{\sqrt{5}}{5^{\frac{2}{2}}} & - \frac{14}{\sqrt{205}} \\ \frac{2}{\sqrt{5}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 5.6.4

Cancel the common factor of $2$ .

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Step 5.6.4.1

Cancel the common factor.

$[\begin{array}{c} \frac{28 \sqrt{5}}{25} & \frac{36 \sqrt{5}}{25} \\ \frac{2 \sqrt{205}}{25} & - \frac{\sqrt{205}}{25} \end{array}] [\begin{array}{c} \frac{\sqrt{5}}{5^{\frac{2}{2}}} & - \frac{14}{\sqrt{205}} \\ \frac{2}{\sqrt{5}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 5.6.4.2

Rewrite the expression.

$[\begin{array}{c} \frac{28 \sqrt{5}}{25} & \frac{36 \sqrt{5}}{25} \\ \frac{2 \sqrt{205}}{25} & - \frac{\sqrt{205}}{25} \end{array}] [\begin{array}{c} \frac{\sqrt{5}}{5^{1}} & - \frac{14}{\sqrt{205}} \\ \frac{2}{\sqrt{5}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 5.6.5

Evaluate the exponent.

$[\begin{array}{c} \frac{28 \sqrt{5}}{25} & \frac{36 \sqrt{5}}{25} \\ \frac{2 \sqrt{205}}{25} & - \frac{\sqrt{205}}{25} \end{array}] [\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14}{\sqrt{205}} \\ \frac{2}{\sqrt{5}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 6

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

$[\begin{array}{c} \frac{28 \sqrt{5}}{25} & \frac{36 \sqrt{5}}{25} \\ \frac{2 \sqrt{205}}{25} & - \frac{\sqrt{205}}{25} \end{array}] [\begin{array}{c} \frac{\sqrt{5}}{5} & - (\frac{14}{\sqrt{205}} \cdot \frac{\sqrt{205}}{\sqrt{205}}) \\ \frac{2}{\sqrt{5}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 7

Combine and simplify the denominator.

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Step 7.1

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

$[\begin{array}{c} \frac{28 \sqrt{5}}{25} & \frac{36 \sqrt{5}}{25} \\ \frac{2 \sqrt{205}}{25} & - \frac{\sqrt{205}}{25} \end{array}] [\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{\sqrt{205} \sqrt{205}} \\ \frac{2}{\sqrt{5}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 7.2

Raise $\sqrt{205}$ to the power of $1$ .

$[\begin{array}{c} \frac{28 \sqrt{5}}{25} & \frac{36 \sqrt{5}}{25} \\ \frac{2 \sqrt{205}}{25} & - \frac{\sqrt{205}}{25} \end{array}] [\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{{\sqrt{205}}^{1} \sqrt{205}} \\ \frac{2}{\sqrt{5}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 7.3

Raise $\sqrt{205}$ to the power of $1$ .

$[\begin{array}{c} \frac{28 \sqrt{5}}{25} & \frac{36 \sqrt{5}}{25} \\ \frac{2 \sqrt{205}}{25} & - \frac{\sqrt{205}}{25} \end{array}] [\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{{\sqrt{205}}^{1} {\sqrt{205}}^{1}} \\ \frac{2}{\sqrt{5}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 7.4

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$[\begin{array}{c} \frac{28 \sqrt{5}}{25} & \frac{36 \sqrt{5}}{25} \\ \frac{2 \sqrt{205}}{25} & - \frac{\sqrt{205}}{25} \end{array}] [\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{{\sqrt{205}}^{1 + 1}} \\ \frac{2}{\sqrt{5}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 7.5

Add $1$ and $1$ .

$[\begin{array}{c} \frac{28 \sqrt{5}}{25} & \frac{36 \sqrt{5}}{25} \\ \frac{2 \sqrt{205}}{25} & - \frac{\sqrt{205}}{25} \end{array}] [\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{{\sqrt{205}}^{2}} \\ \frac{2}{\sqrt{5}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 7.6

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

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Step 7.6.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{205}$ as $205^{\frac{1}{2}}$ .

$[\begin{array}{c} \frac{28 \sqrt{5}}{25} & \frac{36 \sqrt{5}}{25} \\ \frac{2 \sqrt{205}}{25} & - \frac{\sqrt{205}}{25} \end{array}] [\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{{(205^{\frac{1}{2}})}^{2}} \\ \frac{2}{\sqrt{5}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 7.6.2

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$[\begin{array}{c} \frac{28 \sqrt{5}}{25} & \frac{36 \sqrt{5}}{25} \\ \frac{2 \sqrt{205}}{25} & - \frac{\sqrt{205}}{25} \end{array}] [\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{205^{\frac{1}{2} \cdot 2}} \\ \frac{2}{\sqrt{5}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 7.6.3

Combine $\frac{1}{2}$ and $2$ .

$[\begin{array}{c} \frac{28 \sqrt{5}}{25} & \frac{36 \sqrt{5}}{25} \\ \frac{2 \sqrt{205}}{25} & - \frac{\sqrt{205}}{25} \end{array}] [\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{205^{\frac{2}{2}}} \\ \frac{2}{\sqrt{5}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 7.6.4

Cancel the common factor of $2$ .

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Step 7.6.4.1

Cancel the common factor.

$[\begin{array}{c} \frac{28 \sqrt{5}}{25} & \frac{36 \sqrt{5}}{25} \\ \frac{2 \sqrt{205}}{25} & - \frac{\sqrt{205}}{25} \end{array}] [\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{205^{\frac{2}{2}}} \\ \frac{2}{\sqrt{5}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 7.6.4.2

Rewrite the expression.

$[\begin{array}{c} \frac{28 \sqrt{5}}{25} & \frac{36 \sqrt{5}}{25} \\ \frac{2 \sqrt{205}}{25} & - \frac{\sqrt{205}}{25} \end{array}] [\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{205^{1}} \\ \frac{2}{\sqrt{5}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 7.6.5

Evaluate the exponent.

$[\begin{array}{c} \frac{28 \sqrt{5}}{25} & \frac{36 \sqrt{5}}{25} \\ \frac{2 \sqrt{205}}{25} & - \frac{\sqrt{205}}{25} \end{array}] [\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{205} \\ \frac{2}{\sqrt{5}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 8

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

$[\begin{array}{c} \frac{28 \sqrt{5}}{25} & \frac{36 \sqrt{5}}{25} \\ \frac{2 \sqrt{205}}{25} & - \frac{\sqrt{205}}{25} \end{array}] [\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{205} \\ \frac{2}{\sqrt{5}} \cdot \frac{\sqrt{5}}{\sqrt{5}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 9

Combine and simplify the denominator.

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Step 9.1

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

$[\begin{array}{c} \frac{28 \sqrt{5}}{25} & \frac{36 \sqrt{5}}{25} \\ \frac{2 \sqrt{205}}{25} & - \frac{\sqrt{205}}{25} \end{array}] [\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{205} \\ \frac{2 \sqrt{5}}{\sqrt{5} \sqrt{5}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 9.2

Raise $\sqrt{5}$ to the power of $1$ .

$[\begin{array}{c} \frac{28 \sqrt{5}}{25} & \frac{36 \sqrt{5}}{25} \\ \frac{2 \sqrt{205}}{25} & - \frac{\sqrt{205}}{25} \end{array}] [\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{205} \\ \frac{2 \sqrt{5}}{{\sqrt{5}}^{1} \sqrt{5}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 9.3

Raise $\sqrt{5}$ to the power of $1$ .

$[\begin{array}{c} \frac{28 \sqrt{5}}{25} & \frac{36 \sqrt{5}}{25} \\ \frac{2 \sqrt{205}}{25} & - \frac{\sqrt{205}}{25} \end{array}] [\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{205} \\ \frac{2 \sqrt{5}}{{\sqrt{5}}^{1} {\sqrt{5}}^{1}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 9.4

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$[\begin{array}{c} \frac{28 \sqrt{5}}{25} & \frac{36 \sqrt{5}}{25} \\ \frac{2 \sqrt{205}}{25} & - \frac{\sqrt{205}}{25} \end{array}] [\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{205} \\ \frac{2 \sqrt{5}}{{\sqrt{5}}^{1 + 1}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 9.5

Add $1$ and $1$ .

$[\begin{array}{c} \frac{28 \sqrt{5}}{25} & \frac{36 \sqrt{5}}{25} \\ \frac{2 \sqrt{205}}{25} & - \frac{\sqrt{205}}{25} \end{array}] [\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{205} \\ \frac{2 \sqrt{5}}{{\sqrt{5}}^{2}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 9.6

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

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Step 9.6.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{5}$ as $5^{\frac{1}{2}}$ .

$[\begin{array}{c} \frac{28 \sqrt{5}}{25} & \frac{36 \sqrt{5}}{25} \\ \frac{2 \sqrt{205}}{25} & - \frac{\sqrt{205}}{25} \end{array}] [\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{205} \\ \frac{2 \sqrt{5}}{{(5^{\frac{1}{2}})}^{2}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 9.6.2

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$[\begin{array}{c} \frac{28 \sqrt{5}}{25} & \frac{36 \sqrt{5}}{25} \\ \frac{2 \sqrt{205}}{25} & - \frac{\sqrt{205}}{25} \end{array}] [\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{205} \\ \frac{2 \sqrt{5}}{5^{\frac{1}{2} \cdot 2}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 9.6.3

Combine $\frac{1}{2}$ and $2$ .

$[\begin{array}{c} \frac{28 \sqrt{5}}{25} & \frac{36 \sqrt{5}}{25} \\ \frac{2 \sqrt{205}}{25} & - \frac{\sqrt{205}}{25} \end{array}] [\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{205} \\ \frac{2 \sqrt{5}}{5^{\frac{2}{2}}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 9.6.4

Cancel the common factor of $2$ .

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Step 9.6.4.1

Cancel the common factor.

$[\begin{array}{c} \frac{28 \sqrt{5}}{25} & \frac{36 \sqrt{5}}{25} \\ \frac{2 \sqrt{205}}{25} & - \frac{\sqrt{205}}{25} \end{array}] [\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{205} \\ \frac{2 \sqrt{5}}{5^{\frac{2}{2}}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 9.6.4.2

Rewrite the expression.

$[\begin{array}{c} \frac{28 \sqrt{5}}{25} & \frac{36 \sqrt{5}}{25} \\ \frac{2 \sqrt{205}}{25} & - \frac{\sqrt{205}}{25} \end{array}] [\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{205} \\ \frac{2 \sqrt{5}}{5^{1}} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 9.6.5

Evaluate the exponent.

$[\begin{array}{c} \frac{28 \sqrt{5}}{25} & \frac{36 \sqrt{5}}{25} \\ \frac{2 \sqrt{205}}{25} & - \frac{\sqrt{205}}{25} \end{array}] [\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{205} \\ \frac{2 \sqrt{5}}{5} & - \frac{3}{\sqrt{205}} \end{array}]$

Step 10

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

$[\begin{array}{c} \frac{28 \sqrt{5}}{25} & \frac{36 \sqrt{5}}{25} \\ \frac{2 \sqrt{205}}{25} & - \frac{\sqrt{205}}{25} \end{array}] [\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{205} \\ \frac{2 \sqrt{5}}{5} & - (\frac{3}{\sqrt{205}} \cdot \frac{\sqrt{205}}{\sqrt{205}}) \end{array}]$

Step 11

Combine and simplify the denominator.

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Step 11.1

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

$[\begin{array}{c} \frac{28 \sqrt{5}}{25} & \frac{36 \sqrt{5}}{25} \\ \frac{2 \sqrt{205}}{25} & - \frac{\sqrt{205}}{25} \end{array}] [\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{205} \\ \frac{2 \sqrt{5}}{5} & - \frac{3 \sqrt{205}}{\sqrt{205} \sqrt{205}} \end{array}]$

Step 11.2

Raise $\sqrt{205}$ to the power of $1$ .

$[\begin{array}{c} \frac{28 \sqrt{5}}{25} & \frac{36 \sqrt{5}}{25} \\ \frac{2 \sqrt{205}}{25} & - \frac{\sqrt{205}}{25} \end{array}] [\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{205} \\ \frac{2 \sqrt{5}}{5} & - \frac{3 \sqrt{205}}{{\sqrt{205}}^{1} \sqrt{205}} \end{array}]$

Step 11.3

Raise $\sqrt{205}$ to the power of $1$ .

$[\begin{array}{c} \frac{28 \sqrt{5}}{25} & \frac{36 \sqrt{5}}{25} \\ \frac{2 \sqrt{205}}{25} & - \frac{\sqrt{205}}{25} \end{array}] [\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{205} \\ \frac{2 \sqrt{5}}{5} & - \frac{3 \sqrt{205}}{{\sqrt{205}}^{1} {\sqrt{205}}^{1}} \end{array}]$

Step 11.4

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$[\begin{array}{c} \frac{28 \sqrt{5}}{25} & \frac{36 \sqrt{5}}{25} \\ \frac{2 \sqrt{205}}{25} & - \frac{\sqrt{205}}{25} \end{array}] [\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{205} \\ \frac{2 \sqrt{5}}{5} & - \frac{3 \sqrt{205}}{{\sqrt{205}}^{1 + 1}} \end{array}]$

Step 11.5

Add $1$ and $1$ .

$[\begin{array}{c} \frac{28 \sqrt{5}}{25} & \frac{36 \sqrt{5}}{25} \\ \frac{2 \sqrt{205}}{25} & - \frac{\sqrt{205}}{25} \end{array}] [\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{205} \\ \frac{2 \sqrt{5}}{5} & - \frac{3 \sqrt{205}}{{\sqrt{205}}^{2}} \end{array}]$

Step 11.6

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

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Step 11.6.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{205}$ as $205^{\frac{1}{2}}$ .

$[\begin{array}{c} \frac{28 \sqrt{5}}{25} & \frac{36 \sqrt{5}}{25} \\ \frac{2 \sqrt{205}}{25} & - \frac{\sqrt{205}}{25} \end{array}] [\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{205} \\ \frac{2 \sqrt{5}}{5} & - \frac{3 \sqrt{205}}{{(205^{\frac{1}{2}})}^{2}} \end{array}]$

Step 11.6.2

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$[\begin{array}{c} \frac{28 \sqrt{5}}{25} & \frac{36 \sqrt{5}}{25} \\ \frac{2 \sqrt{205}}{25} & - \frac{\sqrt{205}}{25} \end{array}] [\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{205} \\ \frac{2 \sqrt{5}}{5} & - \frac{3 \sqrt{205}}{205^{\frac{1}{2} \cdot 2}} \end{array}]$

Step 11.6.3

Combine $\frac{1}{2}$ and $2$ .

$[\begin{array}{c} \frac{28 \sqrt{5}}{25} & \frac{36 \sqrt{5}}{25} \\ \frac{2 \sqrt{205}}{25} & - \frac{\sqrt{205}}{25} \end{array}] [\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{205} \\ \frac{2 \sqrt{5}}{5} & - \frac{3 \sqrt{205}}{205^{\frac{2}{2}}} \end{array}]$

Step 11.6.4

Cancel the common factor of $2$ .

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Step 11.6.4.1

Cancel the common factor.

$[\begin{array}{c} \frac{28 \sqrt{5}}{25} & \frac{36 \sqrt{5}}{25} \\ \frac{2 \sqrt{205}}{25} & - \frac{\sqrt{205}}{25} \end{array}] [\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{205} \\ \frac{2 \sqrt{5}}{5} & - \frac{3 \sqrt{205}}{205^{\frac{2}{2}}} \end{array}]$

Step 11.6.4.2

Rewrite the expression.

$[\begin{array}{c} \frac{28 \sqrt{5}}{25} & \frac{36 \sqrt{5}}{25} \\ \frac{2 \sqrt{205}}{25} & - \frac{\sqrt{205}}{25} \end{array}] [\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{205} \\ \frac{2 \sqrt{5}}{5} & - \frac{3 \sqrt{205}}{205^{1}} \end{array}]$

Step 11.6.5

Evaluate the exponent.

$[\begin{array}{c} \frac{28 \sqrt{5}}{25} & \frac{36 \sqrt{5}}{25} \\ \frac{2 \sqrt{205}}{25} & - \frac{\sqrt{205}}{25} \end{array}] [\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{205} \\ \frac{2 \sqrt{5}}{5} & - \frac{3 \sqrt{205}}{205} \end{array}]$

Step 12

Multiply $[\begin{array}{c} \frac{28 \sqrt{5}}{25} & \frac{36 \sqrt{5}}{25} \\ \frac{2 \sqrt{205}}{25} & - \frac{\sqrt{205}}{25} \end{array}] [\begin{array}{c} \frac{\sqrt{5}}{5} & - \frac{14 \sqrt{205}}{205} \\ \frac{2 \sqrt{5}}{5} & - \frac{3 \sqrt{205}}{205} \end{array}]$ .

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Step 12.1

Step 12.2

Multiply each row in the first matrix by each column in the second matrix.

$[\begin{array}{c} \frac{28 \sqrt{5}}{25} \cdot \frac{\sqrt{5}}{5} + \frac{36 \sqrt{5}}{25} \cdot \frac{2 \sqrt{5}}{5} & \frac{28 \sqrt{5}}{25} (- \frac{14 \sqrt{205}}{205}) + \frac{36 \sqrt{5}}{25} (- \frac{3 \sqrt{205}}{205}) \\ \frac{2 \sqrt{205}}{25} \cdot \frac{\sqrt{5}}{5} - \frac{\sqrt{205}}{25} \cdot \frac{2 \sqrt{5}}{5} & \frac{2 \sqrt{205}}{25} (- \frac{14 \sqrt{205}}{205}) - \frac{\sqrt{205}}{25} (- \frac{3 \sqrt{205}}{205}) \end{array}]$

Step 12.3

Simplify each element of the matrix by multiplying out all the expressions.

$[\begin{array}{c} 4 & - \frac{20 \sqrt{41}}{41} \\ 0 & - 1 \end{array}]$