Question 1070865

Factorise x^2p^2-8y^2p^2-4x^2q^2+32y^2q^2

Thank you so much if you choose to answer this question! The '^' symbol stands for squared.
<pre>{{{x^2p^2 - 8y^2p^2 - 4x^2q^2 + 32y^2q^2}}}
{{{p^2(x^2 - 8y^2) - 4q^2(x^2 - 8y^2)}}}
{{{(p^2 - 4q^2)(x^2 - 8y^2)}}}
{{{highlight_green((p - 2q)(p + 2q)(x^2 - 8y^2))}}}