Question

Solve this fast please

Answer 1

a=2
b=5

let x+1=0
x-2=0

therefore
x^3+ax^2-bx-6=0

first equation: putting x=-1
-1+a+b-6=0
8+4a-2b-6=0

now we get 2 equations:
a+b=7
4a-2b=-2

solving we get
a=2
b=5