book Maths Puzzle Numerical Ability

how do you simplify a square root such as 3(square root sign)24??? i am not sure how to do a problem like this, if you could break it down and explain to me how to do problems like this example i would be greatful. than you for your time.

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book Other Question

Can you list the factors of the number 8? I need to Simplify and express in simplest radical form.

How would I simplify

(square root of 2 -3)(square root of 2 + 3)
Would I multiply to get

4 square root of -9

which would be

4 * -3

Answer -12