exam Maths Puzzle Numerical Ability

if x is real and s=4x^2+3/2x-1, prove that s^2-4s-12 greater than equal to 0.

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exam Other Question

A cylindrical can is to have the area of its curved surface equal to the sum of the areas of its base and its top. What must the relation between the height and the diameter of thi Solve and check for X:

X X+1 8
----- - ----- = -----
x-2 x x^2-2x

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