exam Maths Puzzle Numerical Ability

can someone check this for me PLEASE?
X^2
OVER
X-3
MINUS
9
OVER
X-3
X^2-9
OVER
X-3
EQUAL
9
OVER
X-3

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exam Other Question

How would you multiply this binomial?

(4c-1)^2

I came up with 16c^2-8c+1... is that correct... or is it 16c^2+8c+1?
can someone help me factor these problems? Thanks.

1.4r^3-4

2.(21-7t)+(3r-rt)

3.x^3+64y^3

4.(x^3+7x^2)(-4x-28)