Question

If $x=-6$ , evaluate
(ii) $3x^2+8x$.

Answer 1

Given : $3x^2+8x$

Substituting $x=-6$ in the given expression

$3x^2+8x=3\times (-6{)}^2+8\times (-6)$

$=3\times 36-48$

$=108-48$

$=60$

Hence, the value of $3x^2+8x$ for $x=-6$ is $60$.