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# Need Help ASAP

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Let $$r$$ be the positive real solution to $$x^3 + \frac{2}{5} x - 1 = 0.$$ Find the exact numerical value of $$r^2 + 2r^5 + 3r^8 + 4r^{11} + \dotsb.$$

Jan 5, 2020

### 1+0 Answers

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Why do you need help ASAP? Is this a homework question, or a test question, or something serious? If so, then we shouldn't answer it.

Jan 5, 2020