Question

If (x-1) is a factor of (2x^2 + kx), then k=? 

a)-3
b)-2
c)3
d)-1

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Answer 1

2(1)²+k(1)=0

2+k=0

k=-2(option b)

hope it helps you mate

Answer 2

x-1=0

x=1

p(x)=2x²+kx

p(1)=2(1)²+k×1=0

2+k=0

k=-2