Question

a minus b whole square minus b minus C whole square

Answer 1

(a-b)²-(b-c)² = [(a-b)-(b-c)][(a-b)+(b-c)] = [a-b-b+c][a-b+b-c] = [a-2b+c][a-c] = a²-2ab+ac-ac+2bc-c² = a²-c²-2ab+2bc