Practicing Success
If $5 x-\frac{1}{4 x}=6, x>0$, then find the value of $25 x^2-\frac{1}{16 x^2}$. |
$6 \sqrt{41}$ 36 $\sqrt{246}$ $6 \sqrt{31}$ |
$6 \sqrt{41}$ |
If $5 x-\frac{1}{4 x}=6 then, If $5 x+\frac{1}{4 x}$ = ? If x - \(\frac{1}{x}\) = n then If x + \(\frac{1}{x}\) = \(\sqrt {n^2 + 4}\) then, $5 x-\frac{1}{4 x}$ = \(\sqrt {6^2 + 5}\) $5 x-\frac{1}{4 x}$ = \(\sqrt {6^2 + 5}\) = \(\sqrt {41}\) $25 x^2-\frac{1}{16 x^2}$ = ($5 x-\frac{1}{4 x}$) ($5 x-\frac{1}{4 x}$) $25 x^2-\frac{1}{16 x^2}$ = (6)(\(\sqrt {41}\)) = $6 \sqrt{41}$ |