exam Maths Puzzle Numerical Ability

What values for X must be excluded in this fraction?

x-3
---------
(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
Give the amplitude and the period of each of the following:
(a) y = 1/2 sin 3x (a)____________
(b) y = 3 cos 1/2x (b)____________ I need to know what the domain is of this problem. y=1 over 3x