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Question
When x = −1, what is the value of the polynomial 2x3 + 2x?
Options
4
2
−2
−4
Solution
−4
Explanation:
Let p(x) = 2x3 + 2x
∴ p(−1) = 2 × (−1)3 + 2 × (−1)
= 2 × (−1) − 2
= − 2 − 2
= −4
Thus, the value of the polynomial when x = −1 is −4.
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