Step-by-step explanation:
1)
[tex]56{x}^{2} [/tex]
2)
[tex]6 {x}^{3} - 3 {x}^{2} + 15x[/tex]
3)
[tex] {x}^{2} + 5x - 36[/tex]
4)
[tex] - 3 {a}^{3} - 5 {a}^{2} + 7[/tex]
5)
[tex] {x}^{2} + 6x + 9[/tex]
