Question

simplify combining like tearms

a)-z square + 13z square -5z + 3z cube -15z

Answer 1

$- {z}^{2} + 13 {z}^{2} - 5z -3 {z}^{3} - 15z \\ = 12 {z}^{2} - 3 {z}^{3} - 20z \\ = z(12z - 3 {z}^{2} - 20)$