HP 9g Graphing manual X 2 7 X + 5 = 0 X 1 = 2.5 , X 2 = 25 X 2 70 X + 49 = 0 X =

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(1)2 X 2 – 7 X + 5 = 0 X 1 = 2.5 , X 2 = 1

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2 [ ] [ ( – ) ] ] 7

[ ] 5

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(2)25 X 2 – 70 X + 49 = 0 X = 1.4

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25 [ ] [ ( – ) ]

70[ ] 49

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