Precalculus Examples

If $Q (x) = 7 x^{2} - 1$ ; find $Q (- 10)$

Step 1

Replace the variable $x$ with $- 10$ in the expression.

$Q (- 10) = 7 {(- 10)}^{2} - 1$

Step 2

Simplify $7 {(- 10)}^{2} - 1$ .

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Step 2.1

Remove parentheses.

$7 {(- 10)}^{2} - 1$

Step 2.2

Simplify each term.

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Step 2.2.1

Raise $- 10$ to the power of $2$ .

$7 \cdot 100 - 1$

Step 2.2.2

Multiply $7$ by $100$ .

$700 - 1$

Step 2.3

Subtract $1$ from $700$ .

$699$