Question

Calcule :

5x² - 3x - 2 = 0

Answer 1

Temos que:

 

$5\text{x}^2-3\text{x}-2=0$

 

$\text{x}=\dfrac{-(-3)\pm\sqrt{(-3)^2-4\cdot5\cdot(-2)}}{2\cdot5}=\dfrac{3\pm7}{10}$

 

$\text{x}'=\dfrac{3+7}{10}=1$

 

$\text{x}"=\dfrac{3-7}{10}=\dfrac{-4}{10}=\dfrac{-2}{5}$