exam Maths Puzzle Numerical Ability

Fully factorise the following expression. (9m^2 - a^2)

Can you help me with this one please?

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exam Other Question

How many pairs of positive integers (a,b) satisfy 1/a + 1/b = 1/2004? What is the formula for converting fractions into decimals ?(i forgot because i was using a shortcut instead of the real formula)