Question

X+1/x = 4, then x² + 1/x² is equal to *

Answer 1

Answer:

$x + \frac{1}{x} = 4 \\ squaring \: both \: the \: sides \\ {x}^{2} + { (\frac{1}{x} )}^{2} = 16 \\ {x }^{2} + \frac{1}{ {x}^{2} } = 16$

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