I don't know how to do this question:

Given that alpha is a root of the equation x^2=2x-3 show that alpha^3=alpha-6.

I have a list of equations involving the roots calling them alpha and beta.

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- Jan 3rd 2010, 06:40 AMStuck ManQuadratics question
I don't know how to do this question:

Given that alpha is a root of the equation x^2=2x-3 show that alpha^3=alpha-6.

I have a list of equations involving the roots calling them alpha and beta. - Jan 3rd 2010, 06:57 AMGrandad
- Jan 3rd 2010, 07:12 AMStuck Man
I see, thanks.

Is there any particular topic that results such as this are in?:

a^2+b^2=(a+b)^2-2ab - Jan 3rd 2010, 07:26 AMGrandad