[tex] x^{2} [/tex] -4x+2=x-2

Răspuns :

x²-4x+2=x-2

x²-4x+2-x+2=0

x²-5x+4=0

x=-(-5)+-√(-5)²-4*1*4/2*1

x=5+-√25-16/2

x=5+-√9/2

x=5+-3/2

x=5+3/2
x=5-3/2

x=4
x=1