Precalculus Examples

If $P (x) = x^{2} + x + 5$ ; find $P (7)$

Step 1

Replace the variable $x$ with $7$ in the expression.

$P (7) = {(7)}^{2} + 7 + 5$

Step 2

Simplify ${(7)}^{2} + 7 + 5$ .

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Step 2.1

Remove parentheses.

${(7)}^{2} + 7 + 5$

Step 2.2

Raise $7$ to the power of $2$ .

$49 + 7 + 5$

Step 2.3

Add $49$ and $7$ .

$56 + 5$

Step 2.4

Add $56$ and $5$ .

$61$