Question

if a^2+b^2+c^2-ab-bc-ca=0, prove that a=b =c​

Answer 1

a^2+b^2+c^2-ab-bc-ca=0

-*+=(-)

a^2= ab ka a cut and ca ka a cut

b^2=ab ka b cut and BC ka b cut

c^2=BC ka c cut and ca ka c cut