Question

Решить уравнение х^2-6х=14х-18-х^2

Answer 1

x² -6x -14x +18 +x² =0
2x² -20x +18 =0
D=400 -144 =256 =16²
x1 =(20 -16)/4 =1
x2 =(20 +16)/4 =9
ответ: x =1, x =9

D=b² -4ac(a=2,b= -20,c=18)
x1,x2=(-b+-корень изD)/2a

Answer 2

Х^2 - 6х = 14x - 18 - x^2
2x^2 - 20x + 18 = 0
2 • ( x^2 - 10x + 9 ) = 0
D = 100 - 36 = 64 ; V D = 8
X1 = ( 10 + 8 ) : 2 = 9
X2 = ( 10 - 8 ) : 2 = 1
Ответ : 9 ; 1