Question

Factorise the following
1.(x - 2y)^2 -16/49
2. 3/64 - 27y^2

Answer 1

I will give you a hint... the first one is called a "difference of squares"
I will do an easier difference of squares and see if you remember...
x^2 - 9 = (x - 3)(x + 3) and remember the sign have to be opposites so when you do the distributive property you don't get a third term : )
Does this hint help?

Answer 2

Form: a^2 - b^2 = (a+b)(a - b).
1. (x-2y)^2 - 16/49 = ((x-2y) + 4/7)((x-2y) - 4/7)