# How do you simplify (x ^ { 2} + x ^ { 3} + 4) - ( x + 4x ^ { 2} - 8)?

${x}^{3} - 3 {x}^{2} + {x}^{2} + 12$
1) multiply negative into the $\left(x + 4 {x}^{2} - 8\right)$ expression