exam Maths Puzzle Numerical Ability

square root of 42a^3b^5 / square root of 14a^2b

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exam Other Question

Divide 3x^3 - 5 by x - 1 and check I have no idea how to solve this problem:

If y is inversely proportional to the square of x, and y=1 when x=4, find y when x=8.