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# Algebra

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

Jan 12, 2022

### 1+0 Answers

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

Hello Guest!

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

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

!

Jan 12, 2022