Question

Expand using identities (3x+4)(3x+9)

Answer 1

Answer:

The answer to this question is...

Answer 2

STEP BY STEP EXPLANATION

WE KNOW, (x+a)(x+b) = x2 + (a+b)x+ab, which is the required identity.

so,  (3x+4)(3X+9) = (3x)2+ (4+9)x+4*3

                              =9x2+13x+12,required expansion