Which of the following is the characteristic equation of A=(3004)A = \begin{pmatrix} 3 & 0 \\ 0 & 4 \end{pmatrix}A=(3004)?
λ2+7=0\lambda^2 + 7 = 0λ2+7=0
λ2−7=0\lambda^2 - 7 = 0λ2−7=0
(λ−3)(λ−4)=0(\lambda - 3)(\lambda - 4) = 0(λ−3)(λ−4)=0
(λ+3)(λ+4)=0(\lambda + 3)(\lambda + 4) = 0(λ+3)(λ+4)=0