Question 240720
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I think you mean:



*[tex \LARGE \ \ \ \ \ \ \ \ \ \ 6\,\cdot\,\sqrt[4]{x+3}\ =\ 15]


In which case,  first multiply by *[tex \Large \frac{1}{6}]


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ \sqrt[4]{x+3}\ =\ \frac{5}{2}]


Raise to the 4th power:


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ x\ +\ 3\ =\ \left(\frac{5}{2}\right)^4]


You can do the arithmetic from here.


John
*[tex \LARGE e^{i\pi} + 1 = 0]
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