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miniradman
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Homework Statement
Simplify; expressing with positive indices.
[tex]\frac{x^{-2} - y^{-2}}{x^{-1} - y^{-1}}[/tex]
The Attempt at a Solution
Hello, I'm doing first year uni math and over the holidays, I forgotten my index laws and as a result I'm stuck on this question
I know that the answer is:
[tex]\frac{x+y}{xy}[/tex]
However I cannot figure out which laws relate to the equation.
I don't think I can just cancel the x's and y's here, because of that takeaway sign. Also I cannot bring the denominator up because I don't know what the rule is for that.
Can someone please give me a hint towards the right direction?
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