(2x/x^2-16)+(7/x-4)

Answer 1

Sorry. I don't know.

Answer 2

2x/((x-4)(x+4)) + 7/(x-4)

so the LCD is (x-4)(x+4)

= 2x/((x+4)(x-4) + 7(x+4)/((x+4)(x-4))
= ( 2x + 7x + 28)/((x+4)(x-4))
= (9x+28)/(x^2 - 16)