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Thread: Need help please: tangent to x^3+3x^2-1 at x=0

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    Need help please: tangent to x^3+3x^2-1 at x=0

    Would someone be able to go over how I would solve this problem. Thank you.

    The tangent to the curve x3+3x2-1 at x=0 and intersects the curve at another point. Determine the co-ordinates of the other point and find the equation of the tangent at the second point. Graph the function and the tangents.

  2. #2
    Elite Member
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    Quote Originally Posted by jakesimpson View Post
    Would someone be able to go over how I would solve this problem. Thank you.

    The tangent to the curve x3+3x2-1 at x=0 and intersects the curve at another point. Determine the co-ordinates of the other point and find the equation of the tangent at the second point. Graph the function and the tangents.
    What are your thoughts?

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    Elite Member stapel's Avatar
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    Cool

    Quote Originally Posted by jakesimpson View Post
    Would someone be able to go over how I would solve this problem. Thank you.
    Did they not cover this stuff in class and in your textbook? Ouch! For which parts are you needing lessons? Do you understand derivatives at all? Etc.

    Quote Originally Posted by jakesimpson View Post
    The tangent to the curve x3+3x2-1 at x=0 and intersects the curve at another point.
    This is not actually a complete sentence, and the "curve" equation isn't even an equation! Did they maybe actually say "y = x^3 + 3x^2 - 1", or "f(x)="?

    Quote Originally Posted by jakesimpson View Post
    Determine the co-ordinates of the other point and find the equation of the tangent at the second point. Graph the function and the tangents.
    The question mentions "the tangent", being one; the instructions mention "the tangents", being two or more. So clearly something is missing here.

    Please reply with the full and exact text of the exercise, the complete instructions, and a clear listing of your thoughts and efforts so far. Thank you!

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