# Subtract 5/(x+4)-(4x)/(x^2-16)

Simplify the denominator.
Rewrite as .
Since both terms are perfect squares, factor using the difference of squares formula, where and .
To write as a fraction with a common denominator, multiply by .
Simplify terms.
Multiply and .
Combine the numerators over the common denominator.
Simplify the numerator.
Apply the distributive property.
Multiply by .
Subtract from .
Subtract 5/(x+4)-(4x)/(x^2-16)