Question

Productos notables

(pq-pn)²
(x-y)²
(m²-n²)²

Answer 1

1) (pq)^2 - 2(pq)(pn) + (pn)^2 =p^2.q^2 -2(p)^2.q.n + (p)^2.(n)^2
2) x^2 - 2xy + y^2
3) (m^2)^2 - 2m^2.n^2 + (n^2)^2 = (m)^4 - 2(m)^.2(n)^2 + (n)^4