1. ## Indicies

Hi everyone.

I know this may seem a little basic for university study, but we are currently doing revison and i'm stuck on this question

Simplify the expression 3^x+y-15^y/3^y-2

2. Originally Posted by tim_mannire
Hi everyone.

I know this may seem a little basic for university study, but we are currently doing revison and i'm stuck on this question

Simplify the expression 3^x+y-15^y/3^y-2
Dear tim,

Do you mean, $\frac{3^{x}+y-15^{y}}{3^{y}-2}$

3. yes, but it is 3 to the power of 3^(x+y)

4. About the only thing I can think of is this:

$\frac{3^{x+y} - 15^y}{3^y - 2} = \frac{3^y(3^x - 5^y)}{3^y - 2}$