Question

if x^2+5x-84=(x+a)(x+b) then a+b is​

Answer 1

Step-by-step explanation:

x²+5x-84=0

x²+12x-7x-84=0

x(x+12) -7(x+12)

(x+12) (x-7)

then

x== -12

x==7

-12+a) =a =12

7+b= b= -7

a+b= 12-7= 5 Answer