Precalculus Examples

$f (x) = | 1 - 5 x |$ , $f (9)$

Step 1

Replace the variable $x$ with $9$ in the expression.

$f (9) = | 1 - 5 \cdot 9 |$

Step 2

Simplify $| 1 - 5 \cdot 9 |$ .

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Step 2.1

Remove parentheses.

$| 1 - 5 \cdot 9 |$

Step 2.2

Multiply $- 5$ by $9$ .

$| 1 - 45 |$

Step 2.3

Subtract $45$ from $1$ .

$| - 44 |$

Step 2.4

The absolute value is the distance between a number and zero. The distance between $- 44$ and $0$ is $44$ .

$44$