Question

Разложите на множители 1. у^2-у+2у-2
2. х^2-25у^2
3.аb^2-2ab+a

Answer 1

1. y^2-y+2y-2=y(y-1)+2(y-1)=(y-1)(y+2)

2. x^2-25y^2=(x-5y)(x+5y)

3.ab^2-2ab+a=ab^2-ab-ab+a=a(b^2-2b+1)=a(b-1)^2