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Math Help - critical point of graph

  1. #1
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    critical point of graph

    i want to find the critical point of the graph
    x^4+x^3-18x^2+24x

    i done that, but have difficulties then
    f'(x)=4x^3+3x^2-36x+24
    then f'(x)= 0 is critical point, but i don't know how to solve f'(x)=0.........
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  2. #2
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    Quote Originally Posted by jackopp View Post
    i want to find the critical point of the graph
    x^4+x^3-18x^2+24x

    i done that, but have difficulties then
    f'(x)=4x^3+3x^2-36x+24
    then f'(x)= 0 is critical point, but i don't know how to solve f'(x)=0.........
    f'(x) = 0 has no rational roots ... you'll need to use technology to approximate them.
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