Question

What is the least common denominator for `\frac{2x}{x-4}+\frac{x}{4-x}`?

Answer 1

`x-4`.

When you multiply the second fraction with `-1`, you get

`(2x)/(x-4)+(-x)/-(4-x) = (2x)/(x-4)+(-x)/(x-4) = x/(x-4)`