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
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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