exam Maths Puzzle Numerical Ability

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)

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exam Other Question
How do you solve equations like these?
Rules:Simplify but leave in radical form

1.) radical 20a^2
2.) radical 30a^7
3.) 5 radical 250

Please help
And thank you simplify:

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