exam Maths Puzzle Numerical Ability

Find the domain of the function
y=3x/4

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exam Other Question

Factor these ?

4x^2 -12x -40


2x^2 -16x +30
Could some help me please. I am not to sure about dividing two rational expressions.
(x^2 +18/3)/ (x-36/3)
I want to thank you for your help.