Question

If (x + 5) is a factor of p(x) = x3 - 20x + 5k then k = ?

Answer 1

Step-by-step explanation:

if x+5 is a factor then x= -5 is the zero of the polynomial

(-5)^3-20(-5)+5k=0

-125+100+5k=0

25=5k

k=5 is the answer for your question