exam Maths Puzzle Numerical Ability

Factor completely.
12x^3 - 3xy^2
This is my answer is it right?
12x(x - 3y)(x - y)

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exam Other Question

please show me how to do this.
Multiply:
(5√[2] + 3)(√[2] - 2√[3]) Solve then graph 7x_>28
Of course the _ is supposed to be under the > Would it be a clear, or solid circle when graphing it?