Question

Find the value of a if x-1 is a factor of x^3+3x^2+4x+a

Answer 1

Here is your answer...

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Answer 2

x-1 = 0

=> x=1

p(x) = x^3 + 3x^2 + 4x +a

p(1) = (1)^3 + 3(1)^2 + 4(1) + a

= 1 + 3 + 4 + a

=> 8+a =0

=> a = -8

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