Question

Verify the identity (x + a)(x - b) = x2 + (a - b)x - ab for a = 2,b=7 x=1

Answer 1

Answer:

The proving is given belowside↓↓↓

Step-by-step explanation:

Given that,

a=2, b=7, x=1

LHS=(x+a)(x-b)

Putting the values,

(1+2)(1-7)

=3×(-6)

=(-18)

RHS=x²+(a-b)x-ab

Putting the values,

1²+(2-7)1-2×7

=1+(-5)1-14

=1-5-14

=(-18)

So, LHS=RHS.(proved)

Therefore, (x+a)(x-b)=x²+(a-b)x-ab.

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