Find the value of $5 x^{3} + 16 x^{2} + 12 x$ for $x = 3$ .

310

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315

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318

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320

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Solution

The correct option is B 315
For $x = 3$ ,
$5 x^{3} + 16 x^{2} + 12 x = 5 \times 3^{3} + 16 \times 3^{2} + 12 \times 3$
$= 315$

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