exam Maths Puzzle Numerical Ability

if f(x)=x(x-1)(x-4)^2, use interval notation to give all values of x where f(x)>0

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exam Other Question

Can someone help me with the problem below, thanks.
Six distinct points lie on the circumference of a circle. How many inscribed quadrilaterals can be drawn having four of these points as vertices?
Thanks again. Help with x^2+3x-5x-15