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

Hi.

What is the least common denominator of the following set:

1/(a+1)^2, 1/(a-1)^2, and 2/a^2-1

Thanks for your help! simplify
square root of 108