+118723 (8x)^2 - (3y)^2
Firstly x and y do not have values.
I expect that you are required to factorise this.
It is a difference ot 2 squares.
$$(a)^2-(b)^2=(a-b)(a+b)$$
your example is
$$(8x)^2-(3y)^2=$$
Can you see the similarity here?
Can you factorise it now? Have a go and I will tell you if it is correct. 
+118723 (8x)^2 - (3y)^2
Firstly x and y do not have values.
I expect that you are required to factorise this.
It is a difference ot 2 squares.
$$(a)^2-(b)^2=(a-b)(a+b)$$
your example is
$$(8x)^2-(3y)^2=$$
Can you see the similarity here?
Can you factorise it now? Have a go and I will tell you if it is correct.
