Question

Рациональное уравнение:

4x+1/x=5

x^2/x+3=9/x+3

Answer 1

4x + 1/x= 5 |*x
4x^2 +1= 5x
4x^2 -5x +1= 0
D= 25 - 4*4*1= 9
√9 = 3
x1= (5+3)/8=1 ;
x2= (5-3)/8= -0,25.

x^2/x +3= 9/x+3 |*x
x^2 +3x =9+3x
x^2= 9
x1= 3;
x2= -3.