exam Maths Puzzle Numerical Ability

f(x)=1/x-4x-5 find the domain of f(x)

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exam Other Question

How do I simplify this expression?

(75x(squared)-12) divided by (35-2x-x(squared) over x(squared)+7x divided by x-5 over 5x(x is to 3rd power)+2x(square) )

i sure hope this m
Factor each polynomial completely.

t^2 - 9w^2