Question

х2+7х+12=О
D =
х2=
х1=

Answer 1

Ответ:

Не правильно записан пример

Answer 2

$x {}^{2} + 7x + 12 = 0.$

a = 1; b = 7; c = 12.

D = b² - 4ac = 7² - 4 · 1 · 12 = 49 - 48 = 1.

$x_{1} = \dfrac{ - b- \sqrt{d} }{2a} = \dfrac{ - 7 - \sqrt{1} }{2 \times 1} = \dfrac{ - 7 - 1}{2} = \dfrac{ - 8}{2} = - 4.$

$x_{2} = \dfrac{ - 7 + 1}{2} = \dfrac{ - 6}{2} = - 3.$