exam Maths Puzzle Numerical Ability

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Find all the points of inflection (concavity)

f(x)= x^4-18x^2+4

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exam Other Question

A piece of wire 24 in long is bent into the shape of rectanlge having width X and Length y. Express the area A of the rectangle as a function of X. Solve. (x - 5)^2 = 7