Question

Factorise the following 4(a-b) square -25( c-d)square​

Answer 1

4(a-b)^2-5(c-d)^2

a^2-b^2 = (a+b )* (a-b)

(4(a-b)+ 5(c-d )) + ((4(a-b)+5a-b)

(4a_4b+5c-5d)+((4a-4b+5a-5b)