exam Maths Puzzle Numerical Ability

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simplify

-6 * square root of 2(5 * square root of 2 - 5 * the square root of 10)

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exam Other Question

simplify (2x^2+4x/8x^2-40x)(6x^3-30x^2/3x^2+6x) If the first differences of a sequence are a constant 3 and the second term is 8 find the first 5 terms of the sequence.

PLEASE SOLVE IF POSSIBLE.
AND COULD YOU PLEASE EXPLAIN HOW
TO SOLVE SO I UNDERSTAND.
THANK YOU SO MUCH!:]