exam Maths Puzzle Numerical Ability

please solve factor and simplify
x^2+3-18/x^2-36

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exam Other Question

Hi, I need help solving this problem on reducing rational expressions:

x^2-2xy+y^2/x^2-y^2

Thanks!
Here is the problem I am having a problem with.

Calculate the IRR for the following investment project:
Initial investment is $75,000; inflows are $20,000 for the next five yea