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March 25, 2017

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what is the value of the discriminant x^2-9

  • trig - ,

    b^2 = 0
    -4ac = -4(1)(-9) = 36
    b^2-4ac = 36
    note
    sqrt (36) is 6

  • trig - ,

    Small correction Damon:

    the formula is

    (-b + sqrt(b^2 - 4ac)) / 2a
    -

    Ans : + sqrt(36) / 2
    -

    ie + 6/2 and -6/3

    Ans : + 3 and -3

    Easier way: Method II

    X^2 -9 = 0

    X^2 = 9

    X = Sqrt(9)

    X = 3 or -3

    Done!

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