Question

find the value of K if (x+1) is a factor of 4x³+3x²-4x+k

Answer 1

X+1=0
x=-1
put x=-1 in eq.
4(-1)^3+ 3(-1)^2-4(-1)+k =0
-4 +3 +4 +k =0
k =-3

Answer 2

x+1=0
x=-1
put value of x on equation
4[-1]cube+3[-1]square-4[-1]+k=0
-4+3+4+k=0
3+k=0
k=-3