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student22641

q10 a b

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  • leung_po_chuen
    2021-05-16 09:42:23
    Put y =0 into C => x^2-10x+21=0 , Hence (x-3)(x-7) =0
  • leung_po_chuen
    2021-05-16 09:43:05
    A(3,0) and B(7,0)
  • leung_po_chuen
    2021-05-16 09:44:23
    Rewrite C: (x-5)^2+(y-4)^2 =8
  • leung_po_chuen
    2021-05-16 09:45:27
    Sorry C: (x-5)^2+(y-2)^2 =8
    •  leung_po_chuen 2021-05-16 09:44:23
    • Rewrite C: (x-5)^2+(y-4)^2 =8
  • leung_po_chuen
    2021-05-16 09:45:46
    G(5,2)
  • leung_po_chuen
    2021-05-16 09:46:57
    Slope of GA = (2-0)/(5-3) = 1
  • leung_po_chuen
    2021-05-16 09:47:31
    Slope of GB = (2-0)/(5-7)= -1
  • leung_po_chuen
    2021-05-16 09:48:03
    Since Slope of GA x Slope of GB = -1 Hence <AGB = 90
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