p(x) =x*3-4x*2+5x-20
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Step-by-step explanation:
p(x) = x^3 -4x^2 -5x -20
p(4) = (4)^3 -4(4)^2 +5(4)-20
= 64 - 64 + 20-20
= 0
similar with x = -5
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