Question

if (x+1) is a factor of polynomial 3xsquare - kx​

Answer 1

p(-1)=3(-1)square - k(-1)

=3+k

k = -3

Answer 2

x+1=0

x=(-1)

3x^2-kx=0

3×(-1)^2-k×(-1)=0

3+k=0

k=-3

hope it helps you.

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