(x-1) (x+2) using the identity ?
Answers
Answered by
9
Answer:
Step-by-step explanation:
Using (x+a) (x+b)=x²+(a+b)x+ab
=(x)²+(-1+2)x +(-1)(2)
=x²+(-1)x-2
=x²-1x-2
Answered by
4
Hi dear ...
Given : (x-1) (x+2)
<> x^2+2× -×-2
<> x^2+×-2
<> x^2-2x +×-2
<> x(×-2) + 1( x-2)
<> (×-2) (×+1) = 0
<> (×-2) =0 =====> x = 2
<> (×+1 ) = 0 ==> x = -1
HOPE IT HELPS YOU.....
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