Решите уравнения -11x2-4x+36=0

Question

Решите уравнения
-11x2-4x+36=0

Answer 1

- 11x² - 4x + 36 = 0
11x² + 4x - 36 = 0
D = b² - 4ac = 16 - 4×11×(-36) = 16 + 1584 = 1600 = 40²
x1 = ( - 4 + 40) / 22 = 36/22 = 18/11= 1 целая 7/11
x2 = ( - 4 - 40) / 22 = - 44/22 = - 2

Ответ: x1 = 1целая 7/11,  x2 = - 2.

Answer 2

-11x^2-4x+36=0
11x^2+4x-36=0
D=b^2-4ac= 16-4·11·(-36)=
=16+1584=1600
x1= -b-корень из D/2a=
= -4-40/22= -2
x2= -b+корень из D/2a=
= -4+40/22= 36/22=
= 1 целая 14/22=
= 1 целая 7/11.
Ответ: -2; 1 целая 7/11.
:-)