Question

Combine like terms.
y - y² + 4y + 7y² – 3 x3 + y² + 4y​

Answer 1

9y + 7y squared - 9x. (Not sure if you wrote the 3 x3 correctly?)

Answer 2

-3x^3+7y^2+9y

Explanation:

y - y² + 4y + 7y² – 3 x3 + y² + 4y​

Combine Like Terms:

=y+−y2+4y+7y2+−3x3+y2+4y

=(−3x3)+(−y2+7y2+y2)+(y+4y+4y)

=−3x3+7y2+9y