Question

X ao quadrado -4x+2=0

Answer 1

${x}^{2} - 4x + 2 = 0$

$x = \frac{ - ( - 4) + - \sqrt{ {( - 4)}^{2} - 4 \times 1 \times 2} }{2 \times 1}$

$x = \dfrac{4 + - \sqrt{16 - 8} }{2}$

$x = \dfrac{4 + - \sqrt{8} }{2}$

$x = 2 + \sqrt{2} \\ x = -2 + \sqrt{2}$