Precalculus Examples

$f (x) = 7 x + 8$ ; $x = 5$

Step 1

Replace the variable $x$ with $5$ in the expression.

$f (5) = 7 (5) + 8$

Step 2

Simplify the result.

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Step 2.1

Multiply $7$ by $5$ .

$f (5) = 35 + 8$

Step 2.2

Add $35$ and $8$ .

$f (5) = 43$

Step 2.3

The final answer is $43$ .

$43$

Step 3