Question

factorise the following equation p4+q4+p2q2

Answer 1

4(p+q)+4pq
4[(p+q)+pq]

Answer 2

it is not an equation it is an expression
p4+q4+p²q²

= (p²)² +(q²)² +2p²q²-p²q²
=(p²+q²)² -p²q²
=(p²+q²)² - (pq)²
=(p²+q² +pq)(p²+q²-pq)    {∵ a²-b² =(a+b)(a-b)}