Question

Решите уравнение (х-2)(х^2+8х+16)=7(х+4)

Answer 1

(x - 2) (x + 4)^2 = 7(x+4)
(x - 2)*(x + 4)^2 - 7(x+4) = 0 
(x+  4) ((x -  2)(x + 4) - 7) = 0 
(x+  4) (x^2 + 2x - 8 - 7) = 0 
(x + 4) ( x^2 + 2x - 15) = 0 

x + 4 = 0 
x1 = -  4

x^2 + 2x - 15 = 0 
D = 4 + 4*15 = 64 
x2 = ( - 2 + 8)/2 = 6/2 = 3;
x3 = ( - 2 - 8)/2 = - 10/2 = - 5

Ответ:
- 5; - 4; 3