Question

Разложите на множители

Answer 1

3.

1)   -2x³-28x²-98x= -2x(x²+14x+49)=-2x(x+7)²

2)   25x²-10xy+y²-9= (5-y)²-9 =(5-5-3)(5-y+30=(2-y)(8-y)

3)   ay^7+y^7-ay³-y³=y^7(a+1)- y³(a+1)=(a+1)(y^7-y³)