If $x = - 6$ , evaluate :

ii) $3 x^{2} + 8 x$

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Solution

Step: Evaluate

Given: $3 x^{2} + 8 x$
Substituting $x = - 6$ in the given expression
$3 x^{2} + 8 x = 3 \times (- 6)^{2} + 8 \times (- 6)$
$= 3 \times 36 - 48$
$= 108 - 48$
$= 60$

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

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