SOLUTION: I do not understand how to work this problem: y=x^3-8x. I know that the y-intercept is (0,0), but I can not figure out how to find the x-intercepts.
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Question 100850: I do not understand how to work this problem: y=x^3-8x. I know that the y-intercept is (0,0), but I can not figure out how to find the x-intercepts. Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website! y=x^3-8x. I know that the y-intercept is (0,0), but I can not figure out how to find the x-intercepts.
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To find the x-intercepts, let y=0.
x^3-8x=0
x(x^2-8)=0
x=0 or x^2-8=0
x=0 or x=2sqrt2 or x=-2sqrt2
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Cheers,
Stan H.
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