It's always fun when math text books just instruct you to 'observe' something without explaining it. Can someone break down for me why these two equal each other?
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If then you can rarrange to get . Now take the 6th root of both sides: . This comes from the rule that . So you have or . Hence is a solution to .
Last edited by ebaines; November 9th 2012 at 11:27 AM.
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