Posted by Jenna on Wednesday, December 19, 2012 at 7:47pm.
Subract. Put the answer in the simplest form 9/x4  5/x+4

Algebra 2  Reiny, Wednesday, December 19, 2012 at 10:04pm
I will assume you mean:
9/(x4)  5(x+4)
LCD is (x4)(x+4)
= (9(x+4)  5(x4))/((x+4)(x4)
= (9x + 36  5x + 20)/(x^2  16)
= (4x + 56)/(x^2  16)