exam Maths Puzzle Numerical Ability

Simplify.

square root 448x^2

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exam Other Question

I just asked a question but was slightly wrong,here is the correct wording: If f(x)=x(x+3)(x-1), use interval notation to give all values of x where f(x) is greater than 0. The last email said less than 0,I typed it wrong. Thanx 2 part question:

Factor x^2n+1 - 2x^n+1 + x

The factors represent the dimensions of a rectangular cylinder, what is special about the cylinder?