exam Maths Puzzle Numerical Ability

I am having some problems here and need some help

Simplify: sqaure root7(9squareroot2-3 square root7)

Thank you

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exam Other Question

I am totally lost, I do not know where to even start, I'm so embaressed, I have never been good at graphs let alone logarith equations. Can a tutor please try and solve this equati 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!