exam Maths Puzzle Numerical Ability

What is -3(2x^3y^-1)^-3

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exam Other Question

The difference between two whole numbers is 8 and the difference between their reciprocals is 1/6. Find the two numbers. Need help with this one: Solve by completing the square. Thank you :)

x^2-1/2x-3/16=0

answer choices:
a. -1/4, 3/4
b. -1/4, 2/3
c. -3/4, 1/4