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Multiplication of Any Polynomial

Solve 15x3+...

Question

Solve $15 x^{3} + x^{7} + x = ?$
If $x = 7$

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Solution

$f (x) = {15 x}^{3} + x^{7} + x$
$f (7) = 15 {(7)}^{3} + {(7)}^{7} + 7$
$= 5, 145 + 8, 23, 543 + 7$
$= 8, 28, 695$

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