Need step by step solution please

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Naeem
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Need step by step solution please

Unread post by Naeem » Sun Nov 24, 2013 2:00 am

What is $x^2 + \dfrac {16}{x^2}$, if $x^2 - 6x + 4 = 0$ ?
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Phlembac Adib Hasan
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Re: Need step by step solution please

Unread post by Phlembac Adib Hasan » Mon Nov 25, 2013 11:41 am

$x^2-6x+4=0\Longleftrightarrow x+\dfrac 4 x=6$. Now square both sides.
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