Finite Math Examples

$f (x) = 9 x - 7$ , $f (- 1) + f (- 3)$

Step 1

Replace the variable $x$ with $- 1$ in the expression.

$f (- 1) = 9 (- 1) - 7$

Step 2

Replace the variable $x$ with $- 3$ in the expression.

$f (- 3) = 9 (- 3) - 7$

Step 3

Replace the function designators in $f (- 1) + f (- 3)$ with the actual functions.

$9 (- 1) - 7 + 9 (- 3) - 7$

Step 4

Simplify $9 (- 1) - 7 + 9 (- 3) - 7$ .

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Step 4.1

Remove parentheses.

$9 (- 1) - 7 + 9 (- 3) - 7$

Step 4.2

Simplify each term.

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Step 4.2.1

Multiply $9$ by $- 1$ .

$- 9 - 7 + 9 (- 3) - 7$

Step 4.2.2

Multiply $9$ by $- 3$ .

$- 9 - 7 - 27 - 7$

Step 4.3

Simplify by subtracting numbers.

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Step 4.3.1

Subtract $7$ from $- 9$ .

$- 16 - 27 - 7$

Step 4.3.2

Subtract $27$ from $- 16$ .

$- 43 - 7$

Step 4.3.3

Subtract $7$ from $- 43$ .

$- 50$