Question

Factorise:-
9(2a – b)2 – 4(2a – b) – 13

Answer 1

let the value of 2a-b be X.

then A. T. Q.

9x^2 - 4x-13.......... 1)

by factorising method :

9x^2-13x+9x-13

x×(9x-13) +1×(9x-13)

(x+1)(9x-13)

from eq. 1)

[2a-b+1][9×(2a-!b) -13]

=[2a-b+1][18a-9b-13]✔️

Answer 2

hope it hlps u............