The derivative of F(x) is 3X^{2}-5 .....That is your first mistake. unless of course your question writing wasn't correct (i.e. you missed out a + in between the two terms, but as you have written it, your derivative is wrong)

To find the points where it crosses the y axis you need to start with F(x) and subsitute x=0 to find all the points where it crosses the y axis.

To find the points crossing the x axis you need to sub in y = 0 and find the values of x that satisfy the equation. I can't tell you how many there are as i am not sure your question writing was correct.

To find stationary points you need to take the derivative equation and make it equal to zero (i.e. dy/dx = 0 and therefore showing that the gradient of the curve = 0, this is the meaning of a stationary point). You then need to solve the derivative equation for values of x that satisfy, but this time you need to substitute the values you get back into the original F(x) equation to find the value of the y coordinate.

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