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20 August, 13:32

What is the discriminant of the polynomial below?

2 х2 + 4x - 9

А. 88

в. 22

с. - 56

D. - 2

+4
Answers (2)
  1. 20 August, 13:45
    0
    А. 88

    Step-by-step explanation:

    2 х^2 + 4x - 9

    This is in the form

    ax^2 + bx + c

    where a=2 b=4 and c=-9

    The discriminant is

    b^2 - 4ac

    Substituting into the equation

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

    16 - (-72)

    16+72

    88
  2. 20 August, 13:59
    0
    Let d = discriminant

    d = b^2 - 4ac

    Let a = 2, b = 4 and c = - 9

    We now plug and chug.

    d = (4) ^2 - 4 (2) (-9)

    d = 16 - 8 (-9)

    d = 16 + 72

    d = 88
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