Question

m^2-4m+8-2m^2 因式分解

Answer 1

m^2-4m+8-2m^2

=-m^2-4m+8

=-(m^2+4m-8)

=-[(m^2+4m+4)-12]

=-[(m+2)^2-12]

=-[(m+2)+√12][(m+2)-√12]

=-(m+2+2√3)(m+2-2√3)