exam Maths Puzzle Numerical Ability

simplify (a^2-9)+(a-3)
i divided them and i came up with a+3 but since it looks like an addition problem im not sure how to work it out.

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exam Other Question

I am stumped on this problem.
Is the square root of x^2 = x an identity (true for all values of x)?
Thanks for your help Simplify, log a x^a - log b a^x + c, as a single logarithm.