Expand for brainliest pls

Expand For Brainliest Pls class=

Answer :

[tex] - 10 {a}^{2} ( - {a}^{3} - 3b + 5a - 1) \\ - 10 {a}^{5} + 30 {a}^{2} b - 50 {a}^{3} + 10 {a}^{2} [/tex]