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11 January, 21:00

F (x) = - 7x2 + 8x + 2

What is the value of the discriminant of f?

How many x-intercepts does the graph of f have?

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Answers (2)
  1. 11 January, 21:10
    0
    120

    2 real intercepts

    Step-by-step explanation:

    f (x) = - 7x^2 + 8x + 2

    The discriminant is

    b^2 - 4ac

    where ax^2 + bx+c

    a=-7 b = 8 c=2

    The discriminant is

    8^2 - 4 (-7) (2)

    64 + 56

    120

    This will have 2 real x intercepts because 120>0
  2. 11 January, 22:01
    0
    120; Two

    Step-by-step explanation:

    -7x2 + 8x + 2

    B² - 4AC

    8² - 4 (-7) (2)

    64 - (-56)

    120

    Since 120 > 0, the graph will have two distinct x-intercepts
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