5bc-5c = 5c(b-1)
10n+15n^2 = 5n(2+3n)
8ab+12bc = 4b(2a+3c)
5y-5x+y^2-xy = 5(y-x) + y(y-x) = (5+y)(y-x)
a^2-9 = (a+3)(a-3)
x^2+10x+25 = (x+5)(x+5) = (x+5)^2
y^2-2y+1 = (y-1)(y-1) = (y-1)^2
a^3+64 = (a+4)(a^2-4a+16)
b^3-1 = (b-1)(b^2+b+1)
5bc-5c = 5c(b-1)
10n+15n^2 = 5n(2+3n)
8ab+12bc = 4b(2a+3c)
5y-5x+y^2-xy = 5(y-x) + y(y-x) = (5+y)(y-x)
a^2-9 = (a+3)(a-3)
x^2+10x+25 = (x+5)(x+5) = (x+5)^2
y^2-2y+1 = (y-1)(y-1) = (y-1)^2
a^3+64 = (a+4)(a^2-4a+16)
b^3-1 = (b-1)(b^2+b+1)