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2 June, 10:12

2x^2-9x+9 what roots does this polynomial has what kind of roots?

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  1. 2 June, 11:02
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    B^2 - 4ac

    (-9) ^2 - 4 (2) (9)

    = 81 - 72

    =9 >0 yet it is a perfect square (3^2 = 9)

    So, it is 2 real and rational roots

    (x-3) (2x-3) = 0

    x = 3, x = 3/2
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