Question

(x-1) (x+2) using the identity ?​

Answer 1

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

Answer 2

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.....

be brainly $$$$$.....