Consider the spectral decomposition , letGj=xjyjT for j=1,2,3 ,n so that A=segma mjGj .
a-Show that each Gj has rank one and that G1,…..Gn are mutually orthogonal in the sense that GkGj=mkjGk for 1<j , k<nb-if p(l) is any scalar polynomial show that p(A) is simple and p(A)= segma p(mj)Gj.The matrix Gj, 1<j<n, is referred to as the constituent matrix of A associated with mj .