Question

X^2+7x-144=0 Помогите решить Ответ x=9 должен быть

Answer 1

х 1;2 = 16 _______-9

Answer 2

D = 7^2 - 4 * (-144) = 49 + 576 = 625.
x1 = - 7 - √625 / 2 = - 7 - 25 / 2 = - 32 / 2 = - 16.
x2 = - 7 + √625 / 2 = - 7 + 25 / 2 = 18 / 2 = 9.

Answer 3

D = 7^2 - 4 * (-144) = 49 + 576 = 625.
x1 = - 7 - √625 / 2 = - 7 - 25 / 2 = - 32 / 2 = - 16.
x2 = - 7 + √625 / 2 = - 7 + 25 / 2 = 18 / 2 = 9.