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Question Number 204478 by a.lgnaoui last updated on 18/Feb/24
soitf:R3→R3f(x,y,z)=(x+y,2x−y,x+z)∙1EcrirelamatriceMdecetteapplicationdanslabasecanoniqueBdeR3∙2Calculerf(1,2,3)de2manieresdifferentes−enutilisantladefinitiondef−enutilisantlamatriceM∙3determinerbssedeKer(f)etdeIm(f)∙4soientv1=(1,1,0)v2=(1,2,1)v3=(1,3,1)MontrerquelafamilleE=(v1,v2,v3)estunebasedeR3∙5Calculerf(v1)donnersescoordonnes(locus)dansbassEavecf(v2)=v1+6v2−4v3f(v3)=2v1+8v2−6v3∙6EcrirelamatriceNdefdansbaseF∙7RetrouvercettematriceapartirdeMenutilisantlaformuledechangementdebase
Answered by A5T last updated on 21/Feb/24
1.f(x,y,z)=(x+y+0z,2x−y+0z,x+0y+z)⇒(abcdefghi)(xyz)=(ax+by+czdx+ey+fzgx+hy+iz)=(x+y+0z2x−y+0zx+0y+z)⇒(abcdefghi)=(1102−10101)2.f(1,2,3)=(3,0,4)3.Ker(f)=(x,y,z)s.t.f(x,y,z)=(0,0,0)⇒x+y=0,2x−y=0,x+z=0⇒x=−y=−2x⇒x=0⇒y=0⇒z=0⇒Ker(f)=(0,0,0)
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