FACTORIZATION BY GROUPING

Question

y2+2y-5y-10
3x+ab+5ax+15ab?

Answer 1

y^2+2y-5y-10
= y(y + 2) - 5(y + 2)
= (y + 2)(y - 5)

the 2nd, 3x+ab+5ax+15ab
cannot be factored, I suspect a typo

Answer 2

Maybe you meant
3ax+ab+5ax+15ab
= 8ax + 16ab
= 8a(x+2b)