Question

Разложить на множители:
х2 - 25 =
ab - ac =
-3a2 -6ab -3b =

Answer 1

1) (x-5)(x+5)
2) a(b-c)
3) -3(a+1)^2

Answer 2

х2 - 25 =(x-5)(x+5)
ab - ac =a(b-c)
-3a2 -6ab -3b2 =-3(a2+2ab+b2)=-3(a+b)2