exam Maths Puzzle Numerical Ability

Help! I am stuck!
I need to simplify.

Here is the original problem:

(sq.rt.3 + 5)(sq.rt.3 -3)

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exam Other Question

Please HELP!!!! I really need it!!!! Given the function h described by h(x)=6x, find each of the following.

a) h (-3)
b) h(2)
c) h(28)

h(-3) =