Question

what is a simpler form of the expression?
(2n + 5n + 3)(4n - 5)

Answer 1

you can sum the 2n and 5n to simplify

Answer 2

(2n + 5n + 3)(4n - 5)=(7n+ 3)(4n - 5)

this is what asnaseer meant by sum... now just multiply them
example:
\[\LARGE (a+b)(c-d)=ac-ad+bc-bd\]
in your case you have:

\[ \LARGE (7n+ 3)(4n - 5)=... \]