![a {?}^{2}5 = 31 \ a {?}^{2}5 = 31 \](https://tex.z-dn.net/?f=a+%7B%3F%7D%5E%7B2%7D5+%3D+31+%5C+)
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a = \frac{\sqrt{155}}{5} \approx 2.48997992<br/>a = -\frac{\sqrt{155}}{5} \approx -2.48997992
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