Question

6a×a-7a-9+9a×a+10a+5

Answer 1

=6a²-7a-9+9a²+10a+5
=15a²+3a-4

hope it is helpful...

Answer 2

⏩$6 {a}^{2} - 7a - 9 + 9 {a}^{2} + 10a + 5 = 15 {a}^{2} + 3a - 4$