exam Maths Puzzle Numerical Ability

Simplify, log a x^a - log b a^x + c, as a single logarithm.

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exam Other Question

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. 5/x+6 + 2/xto the second power+7x+6 = 3/x+1 Solve for x. I do not even know how to start this problem. Thank you in advance.