# Math Help - Help with Indices

1. ## Help with Indices

Having some problems with simplifying these 2 equations. Can anyone help me? Thanks ...

1.

(x+y)^-1 + (x-y)^-1

2.

(27x^2)^1/3 / 1/3(x^3)^1/2

Thanks again.

2. Originally Posted by slippy1
Having some problems with simplifying these 2 equations. Can anyone help me? Thanks ...

1.

(x+y)^-1 + (x-y)^-1

2.

(27x^2)^1/3 / 1/3(x^3)^1/2

Thanks again.
Q1: Make the denominators the same, and simplify the numerator.

Q2: Multiply the powers into the brackets and then simplify.

3. Originally Posted by knighty
Q1: Make the denominators the same, and simplify the numerator.

Q2: Multiply the powers into the brackets and then simplify.
Just to expand slightly on what's been said for Q1, first note that $(x + y)^{-1} + (x - y)^{-1} = \frac{1}{x + y} + \frac{1}{x - y}$.