Question

$\frac{1}{x} - \frac{x}{4} =1 unde x\neq 0$

Answer 1

Se aduce la acelasi numitor 4x si se obtine:
4-x²=4x
-x²-4x+4=0 |·(-1)
x²+4x-4=0
Δ=16+16=32
$x_{1/2}= \frac{-4\pm 4\sqrt{2}}{2} =-2\pm2\sqrt{2}$