Question

Rezolvați ecuația:
4x la puterea a doua-8=2x

Answer 1

Răspuns:

4x² - 8 = 2x

4x² - 2x - 8 = 0

2x² - x  - 4 = 0

$x=\frac{-(-1)+/-\sqrt{(-1)^{2}-4*2*(-4)}}{2*2}\\ \\x=\frac{1+/-\sqrt{33}}{4}\\\\x_{1}=\frac{1-\sqrt{33}}{4}\\ \\x_{2}=\frac{1+\sqrt{33}}{4}$