exam Maths Puzzle Numerical Ability

Multiply the following polynomial:

-4xy(x2 - 3y3)

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exam Other Question

im not understanding how to get the answer for (square root of 5) to the second power - (5 square root of 10) to the second power the answer is 49 but i dont know how they got it.. P R T
X
M S Z
---------------------
W R M A
W S C W *
W P W M *
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W T V V Z A

what is the value of C+S+P?
a)45 b)28 c)9 d)5