exam Maths Puzzle Numerical Ability

What values for X must be excluded in this fraction?

x-3
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(4x-5)(x+1)

How do I figure out the values to be excluded from this fraction? Thank you

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exam Other Question

Can you please help me factor this expression?
a5</sup> + b5</sup>.
Thank you so much for your help.</PRE> Find a polynomial of degree 4, having zeros 2, i, -2i, and 4.

I know you start out by getting (x-2)(x-i)(x+2i)(x-4), but I dont know where to go from there. Do I take two facto