Question

if x=1 and x=-2 are solution of the Quadratic equation x^2+ax+b=0 than the value of a-b is​

Answer 1

Answer:

I don't know the solution

Answer 2

Answer:

if x=1, a+b= -1 ----1)

if x= -2, 2a-b=4 -----2)

we get

a=1

b= -2

a-b=3