Question

Разложите на множители:
6а^2-6
5а^2+10аб+5б^2
х+5у+х^2-25у^2
9-с^2+а^2-6а

Answer 1

1)6a2-6=6a(a-1)(a+1)
2)5a2+10ab+5b2=5(a+b)^2
3)x+5y+x2-25y2=x(1+x)+5y(1-5y)(1+5y)=(x+5y)(1+x)(1-5y)(1+5y)
4)9-c2+a2-6a=(3-c)(3+c)+a(a-6)=(3-c)(3+c)(1+a)(a-6)