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If x^2 - x - 1 = 0, what is the value of \( x^3 - 2x^2\)?

 Jan 12, 2022
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If \(x^2 - x - 1 = 0\), what is the value of \(x^3 - 2x^2 \)?

 

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\(x^2-x-1=0\\ \color{blue}x\in\{-0.618034,1.68034\}\)

\(If\ x\in\{-0.618034,1.68034\}, then\ \color{blue}x^3-2x^2=-1\)

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 Jan 12, 2022

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