x^2/7-3=20

First add '3' to both sides of the equation to get

x^2 / 7 = 23     then multiply both sides by 7 to get:

x^2 = 161        Now, take the sqrt of both sides

x = sqrt(161) = 12.69

hey, its this question : x^2/7-3=20 i dont really know where to start

\(x^{\frac{2}{7} } -3=20\) 

\(x^{\frac{2}{7} } =17\)

\(\frac{2}{7} * ln x = ln 17\)

\(ln x = ln17 * \frac {7}{2}\)

\(x=e^{ln17 * \frac {7}{2}} \)

\(x=20256.8179387\)

  !

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