exam Maths Puzzle Numerical Ability

Find the minimum of P(x) = 3x^2 + 6x - 1.

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exam Other Question

(3x^3y^5m^2)(x^2y)^-2
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x^2y^0y^-4

This problem needs to be simplified, so far I have (9x^4y^10m^4)(x^-4y^2)
Am I anywhere close to the correct answer?
How do I simplify a logarithm such as this{{{10^(-10log3)}}}
I have tried to solve by finding the value of the logarithm but I don't think that is the right way to answer because