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a) Determine an equation, in simplified form, for the family of cubic functions with zeros 2 +- sqrt5 and 0.
b) Determine an equation for the member of the family with graph passing through point (2,20)

  • Math -

    Since you have given me 4 distinct roots, the equation must be a quartic not a cubic
    it would be

    y = ax(x-2)(x+√5)(x-√5)
    = ax(x-2)(x^2 - 5)

    to find a, sub in your given point (2,20)

  • Math -

    thank you again!

  • Math -

    If you mean roots of 0,2+√5 and 2-√5, then then

    y = x^3 - 4x^2 - x

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