Evaluate Using the Given Value 3x^2-1 when x=2

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

Step 1

Replace the variable $x$ with $2$ in the expression.

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

Step 2

Simplify each term.

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

$3 \cdot 4 - 1$

Multiply $3$ by $4$ .

$12 - 1$

Step 3

Subtract $1$ from $12$ .

$11$