Question

find value of k if (x+1) is a factor of x^3 + 3x^2 -kx +7
find the answer i will mark as brainiest ​

Answer 1

x+1 is a factor

x+1=0

x=-1

x³+3x²-kx+7=0

(-1)³+3(-1)²-k(-1)+7=0

-1+3+k+7=0

-2+k+7=0

5+k=0

k=-5