exam Maths Puzzle Numerical Ability

Please help me solve this problem. it says to multipy and simplify:3x^2-4x-4/x^2*4x^2+9x+5/12x^2+23x+10

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solve for n

5 P(2n,2) P(n,2) = 16 P(2n-1,3) The sum of two consecutive even number is 130. Find the product of the two numbers.