## andreadesirepen Group Title Simplify one year ago one year ago

2. satellite73

one way it so multiply top and bottom by $$81x^2$$ to clear the complex faction after that you will factor and cancel

3. satellite73

first step give $\frac{9x^2-81x}{x^2-81}$

what do i do now?

5. abb0t

stake out common factors. 9x^2 - 81x is the same as 9x(x-9) and x^2-81 is the same as (x+9)(x-9). Cancel the common factors and there's your answer :)

6. abb0t