Question

How do you combine like terms in `(5y ^ { 2} + 6y + 9) - ( 3y ^ { 2} + 8y - 5) + ( - 2y ^ { 2} - 6y - 2)`?

Answer 1

Separate like and unlike terms...........

Explanation:

`(5y^2+6y+9)-(3y^2+8y-5)+(-2y^2-6y-2)=`

`(5y^2-3y^2-2y^2)+(6y-8y-6y)+(9+5-2)`

You will note that the signs of SOME of the terms have changed, because `-(x-y)=y-x` etc.

`(5y^2-3y^2-2y^2)+(6y-8y-6y)+(9+5-2)`

`=cancel(5y^2-3y^2-2y^2)+(cancel(6y)-8y-cancel(6y))+(9+5-2)`

`=??`