fully expand and simplfy

Question

(−6y^5+10)(5y^7+2y+7)

Answer 1

To fully expand:

-6y^5 * 5y^7 + -6y^5 * 2y + -6y^5 * 7 + 10 * 5y^7 + 10 * 2y + 10 * 7

To simplify:

-30y^12 - 12y^6 - 42y^5 + 50y^7 + 20y + 70