exam Maths Puzzle Numerical Ability

hi could you please help me solve this problem?
f(x)=√4xy^4 √8x^3y^2/√2x^-4y^5
thank you

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exam Other Question

If fifteen less than two times a number is divided by six more than the number, the result is four less than 9 times the reciprocal of that number. Find the number P DOLLARS IS INVESTED AT ANNUAL INTREST RATE R FOR 1 YEAR. IF THE INTEREST IS COMPOUNDED SEMIANNUALYY, THEN THE POLYNOMIAL P(1+R OVER 2)^2 REPRESENTS THE VALUE OF THE INVESTMENT AF