Aflatil pe x din ecuatia :(x-2)la2-7=2

Răspuns :

(x-2)^2-7=2
x^2=2+7
x^2-4x+4=9
x^2-4x+4-9=0
x^2-4x-5=0
Delta=b^2-4ac
Delta=16-4*1*(-5)
Delta=16+20
Delta=36
Radical delta=6

x1=-b-rad delta/2a
x1=-(-4)-6/2
x1=4-6/2
x1=-2/2
x1=-1

x2=-b+rad delta/2a
x2=-(-4)+6/2
x2=4+6/2
x2=10/2
x2=5