I do know what a polynomial is..... but this problem I don't understand
( y2-3y+6) (y1-3y2+y3) =
Why does the above equal y3-2y2-2y+6? I know you have to combine the like terms, Like terms are like y2 - 3y2 Right???
How are they adding the like terms, these are the steps I'm not understanding.