exam Maths Puzzle Numerical Ability

Simplify: [(27^-2x)(25^x)^4(3^6x)^1/2]/ 9^x(625^(x-1))^-2

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I need help solving:
x(x+2)(x+4)=315
i know the answer, i just have to figure out how to get there other than trial and error. These word problems are killing me today. The value:v(in dollars per acre) of a wheat crop (d) days after planting is given by v=6d-.05d^2 for 20<d<80. Find the maximum value for