Question

How do you simplify `-2u ^ { 2} + 9u ^ { 2}`?

Answer 1

`7u^2`

Explanation:

In Algebra you can only add like terms. In this case the two terms have exactly the same variables, so they are are like.

`-2u^2 +9u^2` can also be written as `9u^2 -2u^2`

This gives `7u^2`

Simplify the numerical coefficients and keep the variable the same.