exam Maths Puzzle Numerical Ability

Write as a single logarithm: log 12 + log (x-2) - log 2.
I thought that I might have to turn it into exponetial form first but Im not sure.

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exam Other Question

Solve the folowing system.
x - y = 1
x + y = 1
factor:

15x^2 + 31x + 10