Question

Решите уравнения.
номер 3

Answer 1

Здравствуйте!

а)
$x {}^{2} = 0.64 \ x1 = 0.8 \ x2 = - 0.8$

б)
$3x {}^{2} - 7 = 14 \ 3x {}^{2} = 21 \ x {}^{2} = 7 \ x1 = sqrt{7} \ x2 = - sqrt{7}$

в)
$(x + 7) {}^{2} = 36 \ x {}^{2} + 14x + 49 = 36 \ x {}^{2} + 14x + 13 = 0 \ \ x1.2 = frac{ - 14 + - sqrt{14 {}^{2} - 4 times 13 times 1 } }{2} \ \ x1.2 = frac{ - 14 + - 12}{2} \ \ x1 = - 13 \ x2 = - 1$

Удачи в учебе!