Question

If x=-1 is a zero of the polynomial f(x) =xcube-2x^+4x+k write the value of k

Answer 1

Answer:

-1-2-4+k=0

K=7..........।

Answer 2

Step-by-step explanation:

x= -1

x³-2x²+4x+k=0

(-1)³ -2(-1)² +4(-1) +k=0

-1-2-4+k=0

-3-4+k=0

-7+k=0

∴k= +7