Find the value of the polynomial $(3 x^{3}) \times (4 x^{2}) + 7 x^{5}$ when $x = 3$ .

4617

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4613

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4611

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4619

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Solution

The correct option is A $4617$
$3 x^{3} (4 x^{2}) + 7 x^{5} = 12 x^{5} + 7 x^{5} = 19 x^{5}$ .
To find the value of the expression for $x = 3$ , we have to substitute $x = 3$ .
So, $19 (3)^{5} = 19 (243) = 4617$

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