# How do you find the sum or difference of (a^3-3a^2+4)-(4a^2+7)?

Mar 22, 2018

${a}^{3} - 7 {a}^{2} - 3$

#### Explanation:

You need to remove the brackets.

$\left({a}^{3} - 3 {a}^{2} + 4\right) - \left(4 {a}^{2} + 7\right)$

$= {a}^{3} - 3 {a}^{2} + 4 - 4 {a}^{2} - 7$

${a}^{3} - 7 {a}^{2} - 3$