Question

Решить уравнение х^2-6х=14х-18-х^2

Answer 1

 X^2 - 6X = 14X - 18 - X^2 
- X^2 - X^2 + 14X + 6X - 18 = 0 
- 2X^2 + 20X - 18 = 0
D = 400 - 4*(-2)*(-18) = 400 - 144 = 256 
V D = 16 
X1 = ( - 20 + 16) : ( - 4 ) = ( - 4 ) : ( - 4 ) = 1 
X2 = ( - 36) : ( - 4 ) = 9 
 ОТВЕТ: 1 и 9