Finite Math Examples

$s \cdot 1 s \cdot 2 [\begin{array}{c} 0.4 & 0.6 \\ 0.6 & 0.4 \end{array}]$

Step 1

Multiply $s$ by $s$ by adding the exponents.

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Step 1.1

Move $s$ .

$s \cdot s \cdot 1 \cdot 2 [\begin{array}{c} 0.4 & 0.6 \\ 0.6 & 0.4 \end{array}]$

Step 1.2

Multiply $s$ by $s$ .

$s^{2} \cdot 1 \cdot 2 [\begin{array}{c} 0.4 & 0.6 \\ 0.6 & 0.4 \end{array}]$

Step 2

Simplify $s^{2} \cdot 1 \cdot 2 [\begin{array}{c} 0.4 & 0.6 \\ 0.6 & 0.4 \end{array}]$ .

$s^{2} \cdot 2 [\begin{array}{c} 0.4 & 0.6 \\ 0.6 & 0.4 \end{array}]$

Step 3

Move $2$ to the left of $s^{2}$ .

$2 \cdot s^{2} [\begin{array}{c} 0.4 & 0.6 \\ 0.6 & 0.4 \end{array}]$

Step 4

Multiply $2 s^{2}$ by each element of the matrix.

$[\begin{array}{c} 2 s^{2} \cdot 0.4 & 2 s^{2} \cdot 0.6 \\ 2 s^{2} \cdot 0.6 & 2 s^{2} \cdot 0.4 \end{array}]$

Step 5

Simplify each element in the matrix.

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Step 5.1

Multiply $0.4$ by $2$ .

$[\begin{array}{c} 0.8 s^{2} & 2 s^{2} \cdot 0.6 \\ 2 s^{2} \cdot 0.6 & 2 s^{2} \cdot 0.4 \end{array}]$

Step 5.2

Multiply $0.6$ by $2$ .

$[\begin{array}{c} 0.8 s^{2} & 1.2 s^{2} \\ 2 s^{2} \cdot 0.6 & 2 s^{2} \cdot 0.4 \end{array}]$

Step 5.3

Multiply $0.6$ by $2$ .

$[\begin{array}{c} 0.8 s^{2} & 1.2 s^{2} \\ 1.2 s^{2} & 2 s^{2} \cdot 0.4 \end{array}]$

Step 5.4

Multiply $0.4$ by $2$ .

$[\begin{array}{c} 0.8 s^{2} & 1.2 s^{2} \\ 1.2 s^{2} & 0.8 s^{2} \end{array}]$

Step 6

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 7

Find the determinant.

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Step 7.1

The determinant of a $2 \times 2$ matrix can be found using the formula $| \begin{array}{c} a & b \\ c & d \end{array} | = a d - c b$ .

$0.8 s^{2} (0.8 s^{2}) - 1.2 s^{2} (1.2 s^{2})$

Step 7.2

Simplify the determinant.

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Step 7.2.1

Simplify each term.

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Step 7.2.1.1

Rewrite using the commutative property of multiplication.

$0.8 \cdot 0.8 s^{2} s^{2} - 1.2 s^{2} (1.2 s^{2})$

Step 7.2.1.2

Multiply $s^{2}$ by $s^{2}$ by adding the exponents.

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Step 7.2.1.2.1

Move $s^{2}$ .

$0.8 \cdot 0.8 (s^{2} s^{2}) - 1.2 s^{2} (1.2 s^{2})$

Step 7.2.1.2.2

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

$0.8 \cdot 0.8 s^{2 + 2} - 1.2 s^{2} (1.2 s^{2})$

Step 7.2.1.2.3

Add $2$ and $2$ .

$0.8 \cdot 0.8 s^{4} - 1.2 s^{2} (1.2 s^{2})$

Step 7.2.1.3

Multiply $0.8$ by $0.8$ .

$0.64 s^{4} - 1.2 s^{2} (1.2 s^{2})$

Step 7.2.1.4

Rewrite using the commutative property of multiplication.

$0.64 s^{4} - 1.2 \cdot 1.2 s^{2} s^{2}$

Step 7.2.1.5

Multiply $s^{2}$ by $s^{2}$ by adding the exponents.

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Step 7.2.1.5.1

Move $s^{2}$ .

$0.64 s^{4} - 1.2 \cdot 1.2 (s^{2} s^{2})$

Step 7.2.1.5.2

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

$0.64 s^{4} - 1.2 \cdot 1.2 s^{2 + 2}$

Step 7.2.1.5.3

Add $2$ and $2$ .

$0.64 s^{4} - 1.2 \cdot 1.2 s^{4}$

Step 7.2.1.6

Multiply $- 1.2$ by $1.2$ .

$0.64 s^{4} - 1.44 s^{4}$

Step 7.2.2

Subtract $1.44 s^{4}$ from $0.64 s^{4}$ .

$- 0.8 s^{4}$

Step 8

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

Step 9

Substitute the known values into the formula for the inverse.

$\frac{1}{- 0.8 s^{4}} [\begin{array}{c} 0.8 s^{2} & - 1.2 s^{2} \\ - 1.2 s^{2} & 0.8 s^{2} \end{array}]$

Step 10

Move the negative in front of the fraction.

$- \frac{1}{0.8 s^{4}} [\begin{array}{c} 0.8 s^{2} & - 1.2 s^{2} \\ - 1.2 s^{2} & 0.8 s^{2} \end{array}]$

Step 11

Rewrite $1$ as $1 (1)$ .

$- \frac{1 (1)}{0.8 s^{4}} [\begin{array}{c} 0.8 s^{2} & - 1.2 s^{2} \\ - 1.2 s^{2} & 0.8 s^{2} \end{array}]$

Step 12

Factor $0.8$ out of $0.8 s^{4}$ .

$- \frac{1 (1)}{0.8 (s^{4})} [\begin{array}{c} 0.8 s^{2} & - 1.2 s^{2} \\ - 1.2 s^{2} & 0.8 s^{2} \end{array}]$

Step 13

Separate fractions.

$- (\frac{1}{0.8} \cdot \frac{1}{s^{4}}) [\begin{array}{c} 0.8 s^{2} & - 1.2 s^{2} \\ - 1.2 s^{2} & 0.8 s^{2} \end{array}]$

Step 14

Divide $1$ by $0.8$ .

$- (1.25 \frac{1}{s^{4}}) [\begin{array}{c} 0.8 s^{2} & - 1.2 s^{2} \\ - 1.2 s^{2} & 0.8 s^{2} \end{array}]$

Step 15

Combine $1.25$ and $\frac{1}{s^{4}}$ .

$- \frac{1.25}{s^{4}} [\begin{array}{c} 0.8 s^{2} & - 1.2 s^{2} \\ - 1.2 s^{2} & 0.8 s^{2} \end{array}]$

Step 16

Multiply $- \frac{1.25}{s^{4}}$ by each element of the matrix.

$[\begin{array}{c} - \frac{1.25}{s^{4}} (0.8 s^{2}) & - \frac{1.25}{s^{4}} (- 1.2 s^{2}) \\ - \frac{1.25}{s^{4}} (- 1.2 s^{2}) & - \frac{1.25}{s^{4}} (0.8 s^{2}) \end{array}]$

Step 17

Simplify each element in the matrix.

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Step 17.1

Cancel the common factor of $s^{2}$ .

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Step 17.1.1

Move the leading negative in $- \frac{1.25}{s^{4}}$ into the numerator.

$[\begin{array}{c} \frac{- 1.25}{s^{4}} (0.8 s^{2}) & - \frac{1.25}{s^{4}} (- 1.2 s^{2}) \\ - \frac{1.25}{s^{4}} (- 1.2 s^{2}) & - \frac{1.25}{s^{4}} (0.8 s^{2}) \end{array}]$

Step 17.1.2

Factor $s^{2}$ out of $s^{4}$ .

$[\begin{array}{c} \frac{- 1.25}{s^{2} s^{2}} (0.8 s^{2}) & - \frac{1.25}{s^{4}} (- 1.2 s^{2}) \\ - \frac{1.25}{s^{4}} (- 1.2 s^{2}) & - \frac{1.25}{s^{4}} (0.8 s^{2}) \end{array}]$

Step 17.1.3

Factor $s^{2}$ out of $0.8 s^{2}$ .

$[\begin{array}{c} \frac{- 1.25}{s^{2} s^{2}} (s^{2} \cdot 0.8) & - \frac{1.25}{s^{4}} (- 1.2 s^{2}) \\ - \frac{1.25}{s^{4}} (- 1.2 s^{2}) & - \frac{1.25}{s^{4}} (0.8 s^{2}) \end{array}]$

Step 17.1.4

Cancel the common factor.

$[\begin{array}{c} \frac{- 1.25}{s^{2} s^{2}} (s^{2} \cdot 0.8) & - \frac{1.25}{s^{4}} (- 1.2 s^{2}) \\ - \frac{1.25}{s^{4}} (- 1.2 s^{2}) & - \frac{1.25}{s^{4}} (0.8 s^{2}) \end{array}]$

Step 17.1.5

Rewrite the expression.

$[\begin{array}{c} \frac{- 1.25}{s^{2}} \cdot 0.8 & - \frac{1.25}{s^{4}} (- 1.2 s^{2}) \\ - \frac{1.25}{s^{4}} (- 1.2 s^{2}) & - \frac{1.25}{s^{4}} (0.8 s^{2}) \end{array}]$

Step 17.2

Combine $\frac{- 1.25}{s^{2}}$ and $0.8$ .

$[\begin{array}{c} \frac{- 1.25 \cdot 0.8}{s^{2}} & - \frac{1.25}{s^{4}} (- 1.2 s^{2}) \\ - \frac{1.25}{s^{4}} (- 1.2 s^{2}) & - \frac{1.25}{s^{4}} (0.8 s^{2}) \end{array}]$

Step 17.3

Multiply $- 1.25$ by $0.8$ .

$[\begin{array}{c} \frac{- 1}{s^{2}} & - \frac{1.25}{s^{4}} (- 1.2 s^{2}) \\ - \frac{1.25}{s^{4}} (- 1.2 s^{2}) & - \frac{1.25}{s^{4}} (0.8 s^{2}) \end{array}]$

Step 17.4

Move the negative in front of the fraction.

$[\begin{array}{c} - \frac{1}{s^{2}} & - \frac{1.25}{s^{4}} (- 1.2 s^{2}) \\ - \frac{1.25}{s^{4}} (- 1.2 s^{2}) & - \frac{1.25}{s^{4}} (0.8 s^{2}) \end{array}]$

Step 17.5

Multiply $- \frac{1.25}{s^{4}} (- 1.2 s^{2})$ .

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Step 17.5.1

Multiply $- 1.2$ by $- 1$ .

$[\begin{array}{c} - \frac{1}{s^{2}} & 1.2 \frac{1.25}{s^{4}} s^{2} \\ - \frac{1.25}{s^{4}} (- 1.2 s^{2}) & - \frac{1.25}{s^{4}} (0.8 s^{2}) \end{array}]$

Step 17.5.2

Combine $1.2$ and $\frac{1.25}{s^{4}}$ .

$[\begin{array}{c} - \frac{1}{s^{2}} & \frac{1.2 \cdot 1.25}{s^{4}} s^{2} \\ - \frac{1.25}{s^{4}} (- 1.2 s^{2}) & - \frac{1.25}{s^{4}} (0.8 s^{2}) \end{array}]$

Step 17.5.3

Multiply $1.2$ by $1.25$ .

$[\begin{array}{c} - \frac{1}{s^{2}} & \frac{1.5}{s^{4}} s^{2} \\ - \frac{1.25}{s^{4}} (- 1.2 s^{2}) & - \frac{1.25}{s^{4}} (0.8 s^{2}) \end{array}]$

Step 17.5.4

Combine $\frac{1.5}{s^{4}}$ and $s^{2}$ .

$[\begin{array}{c} - \frac{1}{s^{2}} & \frac{1.5 s^{2}}{s^{4}} \\ - \frac{1.25}{s^{4}} (- 1.2 s^{2}) & - \frac{1.25}{s^{4}} (0.8 s^{2}) \end{array}]$

Step 17.6

Cancel the common factor of $s^{2}$ and $s^{4}$ .

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Step 17.6.1

Factor $s^{2}$ out of $1.5 s^{2}$ .

$[\begin{array}{c} - \frac{1}{s^{2}} & \frac{s^{2} \cdot 1.5}{s^{4}} \\ - \frac{1.25}{s^{4}} (- 1.2 s^{2}) & - \frac{1.25}{s^{4}} (0.8 s^{2}) \end{array}]$

Step 17.6.2

Cancel the common factors.

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Step 17.6.2.1

Factor $s^{2}$ out of $s^{4}$ .

$[\begin{array}{c} - \frac{1}{s^{2}} & \frac{s^{2} \cdot 1.5}{s^{2} s^{2}} \\ - \frac{1.25}{s^{4}} (- 1.2 s^{2}) & - \frac{1.25}{s^{4}} (0.8 s^{2}) \end{array}]$

Step 17.6.2.2

Cancel the common factor.

$[\begin{array}{c} - \frac{1}{s^{2}} & \frac{s^{2} \cdot 1.5}{s^{2} s^{2}} \\ - \frac{1.25}{s^{4}} (- 1.2 s^{2}) & - \frac{1.25}{s^{4}} (0.8 s^{2}) \end{array}]$

Step 17.6.2.3

Rewrite the expression.

$[\begin{array}{c} - \frac{1}{s^{2}} & \frac{1.5}{s^{2}} \\ - \frac{1.25}{s^{4}} (- 1.2 s^{2}) & - \frac{1.25}{s^{4}} (0.8 s^{2}) \end{array}]$

Step 17.7

Multiply $- \frac{1.25}{s^{4}} (- 1.2 s^{2})$ .

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Step 17.7.1

Multiply $- 1.2$ by $- 1$ .

$[\begin{array}{c} - \frac{1}{s^{2}} & \frac{1.5}{s^{2}} \\ 1.2 \frac{1.25}{s^{4}} s^{2} & - \frac{1.25}{s^{4}} (0.8 s^{2}) \end{array}]$

Step 17.7.2

Combine $1.2$ and $\frac{1.25}{s^{4}}$ .

$[\begin{array}{c} - \frac{1}{s^{2}} & \frac{1.5}{s^{2}} \\ \frac{1.2 \cdot 1.25}{s^{4}} s^{2} & - \frac{1.25}{s^{4}} (0.8 s^{2}) \end{array}]$

Step 17.7.3

Multiply $1.2$ by $1.25$ .

$[\begin{array}{c} - \frac{1}{s^{2}} & \frac{1.5}{s^{2}} \\ \frac{1.5}{s^{4}} s^{2} & - \frac{1.25}{s^{4}} (0.8 s^{2}) \end{array}]$

Step 17.7.4

Combine $\frac{1.5}{s^{4}}$ and $s^{2}$ .

$[\begin{array}{c} - \frac{1}{s^{2}} & \frac{1.5}{s^{2}} \\ \frac{1.5 s^{2}}{s^{4}} & - \frac{1.25}{s^{4}} (0.8 s^{2}) \end{array}]$

Step 17.8

Cancel the common factor of $s^{2}$ and $s^{4}$ .

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Step 17.8.1

Factor $s^{2}$ out of $1.5 s^{2}$ .

$[\begin{array}{c} - \frac{1}{s^{2}} & \frac{1.5}{s^{2}} \\ \frac{s^{2} \cdot 1.5}{s^{4}} & - \frac{1.25}{s^{4}} (0.8 s^{2}) \end{array}]$

Step 17.8.2

Cancel the common factors.

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Step 17.8.2.1

Factor $s^{2}$ out of $s^{4}$ .

$[\begin{array}{c} - \frac{1}{s^{2}} & \frac{1.5}{s^{2}} \\ \frac{s^{2} \cdot 1.5}{s^{2} s^{2}} & - \frac{1.25}{s^{4}} (0.8 s^{2}) \end{array}]$

Step 17.8.2.2

Cancel the common factor.

$[\begin{array}{c} - \frac{1}{s^{2}} & \frac{1.5}{s^{2}} \\ \frac{s^{2} \cdot 1.5}{s^{2} s^{2}} & - \frac{1.25}{s^{4}} (0.8 s^{2}) \end{array}]$

Step 17.8.2.3

Rewrite the expression.

$[\begin{array}{c} - \frac{1}{s^{2}} & \frac{1.5}{s^{2}} \\ \frac{1.5}{s^{2}} & - \frac{1.25}{s^{4}} (0.8 s^{2}) \end{array}]$

Step 17.9

Cancel the common factor of $s^{2}$ .

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Step 17.9.1

Move the leading negative in $- \frac{1.25}{s^{4}}$ into the numerator.

$[\begin{array}{c} - \frac{1}{s^{2}} & \frac{1.5}{s^{2}} \\ \frac{1.5}{s^{2}} & \frac{- 1.25}{s^{4}} (0.8 s^{2}) \end{array}]$

Step 17.9.2

Factor $s^{2}$ out of $s^{4}$ .

$[\begin{array}{c} - \frac{1}{s^{2}} & \frac{1.5}{s^{2}} \\ \frac{1.5}{s^{2}} & \frac{- 1.25}{s^{2} s^{2}} (0.8 s^{2}) \end{array}]$

Step 17.9.3

Factor $s^{2}$ out of $0.8 s^{2}$ .

$[\begin{array}{c} - \frac{1}{s^{2}} & \frac{1.5}{s^{2}} \\ \frac{1.5}{s^{2}} & \frac{- 1.25}{s^{2} s^{2}} (s^{2} \cdot 0.8) \end{array}]$

Step 17.9.4

Cancel the common factor.

$[\begin{array}{c} - \frac{1}{s^{2}} & \frac{1.5}{s^{2}} \\ \frac{1.5}{s^{2}} & \frac{- 1.25}{s^{2} s^{2}} (s^{2} \cdot 0.8) \end{array}]$

Step 17.9.5

Rewrite the expression.

$[\begin{array}{c} - \frac{1}{s^{2}} & \frac{1.5}{s^{2}} \\ \frac{1.5}{s^{2}} & \frac{- 1.25}{s^{2}} \cdot 0.8 \end{array}]$

Step 17.10

Combine $\frac{- 1.25}{s^{2}}$ and $0.8$ .

$[\begin{array}{c} - \frac{1}{s^{2}} & \frac{1.5}{s^{2}} \\ \frac{1.5}{s^{2}} & \frac{- 1.25 \cdot 0.8}{s^{2}} \end{array}]$

Step 17.11

Multiply $- 1.25$ by $0.8$ .

$[\begin{array}{c} - \frac{1}{s^{2}} & \frac{1.5}{s^{2}} \\ \frac{1.5}{s^{2}} & \frac{- 1}{s^{2}} \end{array}]$

Step 17.12

Move the negative in front of the fraction.

$[\begin{array}{c} - \frac{1}{s^{2}} & \frac{1.5}{s^{2}} \\ \frac{1.5}{s^{2}} & - \frac{1}{s^{2}} \end{array}]$