book Maths Puzzle Numerical Ability

please help!!

x - 3sqrt(x) - 4 = 0

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book Other Question

how would i graph the following....

y=5-x
y=-1
y=4-3x
x=3y
x-y=-3 Estimate the intervals on which the function g(x)=x^3-x^2+2x-8 is increasing and decreasing