## Answers

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).

Thank you again!.

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

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

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