Question

How do i get the answer for the problem (15y−2)+(−17y+4)

Answer 1

-2y+2 combine like terms. this what your looking for?

Answer 2

FOIL 

Front term ( 15y) multiplied with the Last (4) then multiply the Front term (15y) with the Inside term (-17y). Now, multiply the other Inside term (-2) by the Last term (4) and the Inside term (-17).

Multiply each number by both of the other numbers in the other set of ( ).