IMathAS-libretexts

Solve:

$\displaystyle {4}\sqrt{{{1}+{8}\sqrt{{{x}}}}}={7}$

$\displaystyle {x}=$

Your answer should be a fraction of lowest terms.

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Enter your answer as a number (like 5, -3, 2.2172) or as a calculation (like 5/3, 2^3, 5+4)
Enter DNE for Does Not Exist, oo for Infinity
Decimal values are not allowed