Question

X^3-6x^2+12x-8=27
thnk kiu

Answer 1

x^3−6x^2+12x−8=0

⇔x^3−3x^2.2+3.x.2^2−2^3=0

⇔(x−2)^3=0

⇔(x−2)=0

⇔x=2