Question

can anyone explain factorization​

Answer 1

$\frac{ {p}^{2} - 2pq + {q}^{2} }{3} = 0 \\ {p}^{2} - 2pq + {q}^{2} = 0 \\ {p}^{2} - (pq + pq) + {q}^{2} = 0 \\ {p}^{2} - pq - pq + {q}^{2} = 0 \\ p(p - q) - q(p - q) = 0 \\ (p - q)(p - q)$