Question

7x^2=6-11х *
2 балла
-7; 2/7
-2; 6/7
-2; 3
-2; 3/7

Answer 1

$7 {x}^{2} = 6 - 11x \ 7 {x}^{2} + 11x - 6 = 0 \ D = 11 {}^{2} - 4 times ( - 6) times 7 = 121 + 168 = 289 : (17) \ x_{1} = frac{ - 11 + 17}{14} = frac{6}{14} = frac{3}{7} \ x_{2} = frac{ - 11 - 17}{14} = frac{ - 28}{14} = - 2 \ Ответ: - 2 : ; : frac{3}{7}$