# Precalc 11 – “Week 15”

This week in Precalculus 11, we learned about multiplying, dividing, adding and subtracting Rational Expressions. The hardest part about this unit was simplying rational expressions which had adding and subtracting, especially if these were the denominators:

$\frac{4}{x-5}+\frac{x-7}{5-x}$

Because $x-5=-1(5-x)$, Therefore

$\frac{4}{x-5}+\frac{-x+7}{x-5}$

$\frac{4-x+7}{x-5}$

$\frac{11-x}{x-5}$

Thank You for Reading!