Question

решите уравнение под номером 3

Answer 1

х1,2 = (17 +- корень из (17^2 - 4*7*6))/2*7
x1,2 = (17 +-11)/14
x1 = 28/14 = 2 
x2 = 6/14 = 3/7

Answer 2

$7 {x}^{2} - 17x + 6 = 0 \\ x = \frac{17 + \sqrt{289 - 168} }{14} = \frac{17 + 11}{14} = 2 \\ x = \frac{17 - \sqrt{289 - 168} }{14} = \frac{17 - 11}{14} = \frac{3}{7}$