exam Maths Puzzle Numerical Ability

simplify:

(3x^3 - 1 + 9x) + (3 + 3x)

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exam Other Question

Find the approximate increasing and decreasing intervals:

a) f(x) = x2 - 4x
x (x - 4) =0
x = 4

b) f(x)= 9x -x3 (x to the third power) Which does not represent a possible intersection of a line and a triangle?