exam Maths Puzzle Numerical Ability

x*2-9/4x+12
Please help

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exam Other Question

Can you please help with this one?
(16 - x2)/
(x3 - 2x2 - 8x)
So far I have:
(4-x)(4+x) over
x(x+2)(x-4)
Do this look right and is it as far as I can go?
factor:

10x^2 + 21x - 10