Factorise-              6y-15y^2
     HELP

We will take the common terms in the expressions-

Here in the expression, 3y is a common term.
So,





So, the answer is 

6y-15y^2
3y(2-5y)                                                          (taking 3y as common)
clearly 3y(2-5y) cannot be factorised further hence this is the answer