Question

1 и 2 срочно пж (Фото)​

Answer 1

1.
1)3а-15b=3(a-5b)
2)6a^2-12ab=6a(a-2b)
3)4(a-b)+c(a-b)=(a-b)(4+c)
4) xy-xz+my-mz=(y-z)(x+m)
5)x^2-4x-21=(x+3)(x-7)
2.
1)X^2+7x=0
X^1=-7
X^2=0
2)x(x-7)+3(x-7)=0
X^1=-3
X^2=7