Question

Rozwiąż równianie
a) x-1 x+2
------ = -------
x+2 x+1

b) 5
---------=x
6-x

Answer 1

1. ( x-1) (x+1) = (x+2 ) ( x+2)

x2 -1 = x2 +2x + 2x +4

-1 = 4x +4

4x= -5

x= - 5/4

zad.2 

5 = x ( 6 -x)

5= 6x -x2

x2 - 6x +5=0

delta = b2 -4ac= 36 - 20= 16

pierwiastek z 16 = 4 lub -

x1 = -b - pierw, z delty/2a= (6 -4)/2 = 1

x2 = (6+4)/2= 5