# Indicies

• Mar 10th 2010, 02:41 AM
tim_mannire
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
• Mar 10th 2010, 06:25 AM
Sudharaka
Quote:

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, $\frac{3^{x}+y-15^{y}}{3^{y}-2}$
• Mar 10th 2010, 11:30 AM
tim_mannire
yes, but it is 3 to the power of 3^(x+y)
• Mar 10th 2010, 11:36 AM
icemanfan
About the only thing I can think of is this:

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