Finite Math Examples

$f (- 2) = 2 x - x^{2}$

Step 1

Replace the variable $x$ with $- 2$ in the expression.

$f (- 2) = 2 (- 2) - {(- 2)}^{2}$

Step 2

Simplify the result.

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Step 2.1

Simplify each term.

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Step 2.1.1

Multiply $2$ by $- 2$ .

$f (- 2) = - 4 - {(- 2)}^{2}$

Step 2.1.2

Raise $- 2$ to the power of $2$ .

$f (- 2) = - 4 - 1 \cdot 4$

Step 2.1.3

Multiply $- 1$ by $4$ .

$f (- 2) = - 4 - 4$

Step 2.2

Subtract $4$ from $- 4$ .

$f (- 2) = - 8$

Step 2.3

The final answer is $- 8$ .

$- 8$

Step 3