Question

$( {3a}^{2} + 5y)( {2a}^{3} + y) - {7a}^{3}( {a}^{2} - 3y)$

Answer 1

(3a²+ 5y)(2a³ + y) - 7a³(a² - 3y) = 6a⁵ + 3a²y + 10a³y+ 5y² -7a⁵+21a³y =
= - a⁵ + 31a³y + 3a²y + 5y²