Question

Find the Value of the polynomial
$2x {}^{3} + 2x$
when
$x = - 1$
​

Answer 1

Answer:

$2 {x}^{3} + 2x \\ = 2 ({ - 1})^{3} + 2( - 1) \\ = 2( - 1) - 2 \\ = - 2 - 2 \\ = - 4$

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