Question 84666
Hello there,

18n^2 +(-9n)+4n+(-3n)^2 <-- Exponents can be denoted by the ^ symbol.

= 18n^2 - 5n - 3n^2

= 15n^2 - 5n   

= 5n(3n - 1)


(7x-8x+3)(5x-2)

= 35x^2 - 14x - 40x + 16x + 15x - 6

I'll pass it onto you now.