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y=aX2+bX+c ---> y=X2-6X+5

vertex formula is -b/2a( b=-6,a=1)

vertex=-(-6)/2*1=6/2=3<-----X

plug 3 for X----> y=32-6(3)+5---->y=-4

so vertex is (3,4)

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Q: Vertex of graph x2-6x plus 5?
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