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x+2=0
x=-2
put x=-2 in the given polynomial
(-2)(-2)+ a.(-2)+2. b=0
4-2a+2b=0
-2a+2b=-4
a+b=2
Let:a+b=2 be equ.1&a+b=4 be equ.2
subtract equ.1 from equ.2
x=-2
put x=-2 in the given polynomial
(-2)(-2)+ a.(-2)+2. b=0
4-2a+2b=0
-2a+2b=-4
a+b=2
Let:a+b=2 be equ.1&a+b=4 be equ.2
subtract equ.1 from equ.2
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