Question

(pq + qr ) square - 2pq square+r

Answer 1

hello mate!.....

given.......

$(pq + qr) {}^{2} - (2pq) {}^{2} + r \\ \\ = (pq) {}^{2} + (qr) {}^{2} + 2prq {}^{2} - 4(pq) {}^{2} + r \\ \\ = - 3(pq ){}^{2} + rq {}^{2} (r + p) + r$
hope it helps u