Algebra Examples

$2 x^{2} - 1$ when $x = 3$

Step 1

Replace the variable $x$ with $3$ in the expression.

$2 {(3)}^{2} - 1$

Step 2

Simplify each term.

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Step 2.1

Raise $3$ to the power of $2$ .

$2 \cdot 9 - 1$

Step 2.2

Multiply $2$ by $9$ .

$18 - 1$

Step 3

Subtract $1$ from $18$ .

$17$