A.2B.-2C.±2D.4.W»£Jb’=^fà^W3tW,1IMWSiJÛWtJrï^()A.y=(x-3)2-1B.y=(x+3)2-1C.y=(x-3)2+lD.y=(x+3)2+l5.JΗfcfrfëx2-6x+4=0,()A.(x+3)2=13B.(x+3)2=5C.(x-3)2=13D.(x-3)2=5