Precalculus Examples

$f (x) = 2 x + 5$ ; find $f (1)$

Step 1

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

$f (1) = 2 (1) + 5$

Step 2

Simplify $2 (1) + 5$ .

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Step 2.1

Remove parentheses.

$2 (1) + 5$

Step 2.2

Multiply $2$ by $1$ .

$2 + 5$

Step 2.3

Add $2$ and $5$ .

$7$