Question

128
$\sqrt[7 ]{ - 128}$
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Answer 1

 

$\displaystyle\bf\\\sqrt[\b7]{\bf-128}=?\\128~este~o~putere~a~lui~2.\\\\128=2^{\b7}\\\\-128=\Big(-2\Big)^{\b7}\\\\\sqrt[\b7]{\bf-128}=\sqrt[\b7]{\Big(\bf-2\Big)^{\b7}}=-2\\\\\implies~\boxed{\bf\sqrt[\b{\bf7}]{\bf-128}=-2}$