find P(-1) where P(x)=x³-x²+2x-1.
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Step-by-step explanation:
P(x) = x³-x²+2x-1
P(-1) = (-1)³ - (-1)² + 2(-1) -1
= -1 - 1 + 2×-1 -1
= -1 -1 -2 -1
= -5
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