## Elementary Algebra

5$n^{2}$ + 2n + 3
We write the expression to express this addition problem: (3$n^{2}$ - n + 7) - (-2$n^{2}$ - 3n + 4) = Remove parantheses. 3$n^{2}$ - n + 7 + 2$n^{2}$ + 3n - 4 = Group similar terms. (3$n^{2}$ +2$n^{2}$) + (3n - n) + (7 - 4) = Simplify. 5$n^{2}$ + 2n + 3