exam Maths Puzzle Numerical Ability

I have no clue how to solve this problem would you please show me how?

Factor completely

9x^2 + 12xy + 4y^2 - 25

Thank you I am stuck.

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exam Other Question

Is this formula broke down into the simplest form or can it be refined more?

ECM=LOG((LOG(Rh,EXP(1))/(-478.87/(Tc+64.933))),EXP(1))/-0.16558

Rh=Relative Humidity
Tc=Temp. ( how do you find prime factors