Question

1)а²+в²-2ав-с² 2)а²-16+в²-2ав

Answer 1

а²+b²-2ab- c²= (a²-2ab+b²)- c²= (a-b)²-c² = (a-b-c)(a-b+c)
a²-16+b²-2ab= (a²-2ab+b²) - 4² = (a-b)²-4²= (a-b-4)(a-b+4)
Думаю, как-то так...