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    I read the mark scheme, but I don't understand the method.
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    You have the equation kx+6 = x^3+3x+2k which you can re-arrange as a quadratic = 0, for the line to be a tangent, there must be a single root of the quadratic; so the discriminant must be 0.
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    Thanks so much! I'd "like" your post, but I'm using the app and it keeps crashing. :/
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    (Original post by shushmush)
    Thanks so much! I'd "like" your post, but I'm using the app and it keeps crashing. :/
    No problem.
 
 
 
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