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Question

Let p(x) = 3x3 + 4x2 − 5x + 8. Find p(−2).

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Solution

Let:
px=3x3+4x2-5x+8
Thus, we have:
p-2=3×-23+4×-22-5×-2+8
=3×-8 + 4×4 +10 +8=-24+16+10+8=10

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