Question

Answer this question​

Answer 1

Answer:

Step-by-step explanation:

x-1 is a factor of x²+4x+a

so (1)²+4(1)+a=0

a=-5

x-2 is factor of x²+4x+b

so (2)²+4*2+b=0

b=-4-8=-12

so a+b=-5-12

=-17