Question

$x = \frac{- b + \sqrt{{b}^{2} - 4 \times a \times c}}{2 \times a}$
$a = 1 \\ b = - 7 \\ c = 10 \\ x = ?$
Qual o valor de "x"?​

Answer 1

x = (-b + √(b² - 4 . a . c) ) / 2 . a

x = (7 + √((-7)² - 4 . 1 . 10) ) / 2 . 1

x = (7 + √(49 - 40) )/ 2

x = (7 + √9) / 2

x = (7 + 3) / 2

x = 10 / 2

x = 5