Question

9 (x-2y)square - 4 (x-2y)-13

Answer 1

9(x-2y) ^2-4(x-2y) -13

let x-2y be a

hence, 9(a) ^2-4(a) -13

9a^2-4a-13

9a^2+9a-13a-13

9a(a+1) -13(a+1)

(9a-13) (a+1)