If $x = 4$ , evaluate:
(ii) $5 x^{2} + 4 x$

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Solution

Given: $5 x^{2} + 4 x$
Substituting $x = 4$ in the giren expression
$5 x^{2} + 4 x$ $= 5 (4)^{2} + 4 (4)$
$= 5 (16) + 16$
$= 80 + 16$
$= 96$
Hence, the valus of $5 x^{2} + 4 x$ for $x = 4$ is $96$ .

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