Question

разложите на множители-
1)4ab-28+8a-56
2)-5m^2+10mn-5n^2

Answer 1

1) 4ab-28+8a-56=2(2ab-14+4a-28)
2)- 

Answer 2

1) 4ab-28+8a-56=4ab-84+8a=4(ab-21+2a)
2) -5m^2 + 10mn - 5n^2 = -5(m^2-2mn+n^2)= -5(m-n)^2