Question

determine as raizes reais (se existir) x² - 3 × x +2 =0​

Answer 1

$d = {b}^{2} - 4ac$

$d = { - 3}^{2} - 4 \times (1) \times (2)$

$d = 9 - 8$

$d = 1$

$x = \frac{ - b \frac{ + }{ - } \sqrt{d} }{2a}$

$x = \frac{ - ( - 3) \frac{ + }{ - }1 }{2(1)}$

$x1 = \frac{3 + 1}{2} = 2$

$x2 = \frac{3 - 1}{2} = 1$