exam Maths Puzzle Numerical Ability

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!

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exam Other Question

What is the answer to this question:
square root 20 - square root 5 + 4 square root 8
I tried this:
2 square root 5 - square root 5 + 8 square root 2
square root 5 + 8 square root 2
9 square root 10
18 square root 5 HELP!

simplify

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