# Week 15 Blog

Adding and Subtracting Rational Expressions with Monomial Denominators

$\frac{2}{3} \div \frac{3}{4}$

Firstly, their common denominator is 12 because 3 times 4=12, so that means we need both times 3 or four for each side just for reaching the common denominator 12.

$\frac{6}{12} \div \frac{9}{12}$

so the answer is 2 over 3.

# Week 14 Blog

Things i learned this week: when we solve rational expressions, we need to find their common denominator.

For example:

$\frac{$latex x^2\$+2 over}{$x^2$ -x-6 over }

{$x^2$ -x-6 over }   can be factored into $x^2$-x-6=0

(x-3)(x+2)=o

x=3, x=-2

if we found the common denominator,then we can factor it, that’s the way how we solved this kind of equation.