exam Maths Puzzle Numerical Ability

What values of x may not be used in the expression ((x+5)/(x^2-4))?
I am completely clueless on this stuff it confuses me!
Thanks

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exam Other Question

I just get confused with problems such as:

y=(1/8)x^2

I need to find the x-intercepts, but I do not know how to put the equation into the form that is needed. I believe it is standard form. Dimitruis skipped lunch today to get some sun in the school courtyard. Lying on the grass and looking up at an angle of 22 he could see the top of the flagpole which was about 100 ft away. How tall is the flagpole?