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12 September, 08:47

What are the x-intercepts of the quadratic function? y = x2 - 3x + 2

A) 2 and 1

B) - 2 and 1

C) 2 and - 1

D) 1

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Answers (1)
  1. 12 September, 11:26
    0
    y = x² - 3x + 2

    The x-intercepts can be take by matching the equation to 0, so,

    x² - 3x + 2 = 0

    Δ = b² - 4. a. c

    Δ = - 3² - 4. 1. 2

    Δ = 9 - 4. 1. 2

    Δ = 1

    There 2 real roots.

    x = (-b + - √Δ) / 2a

    x' = (--3 + √1) / 2.1

    x'' = (--3 - √1) / 2.1

    x' = 4 / 2

    x'' = 2 / 2

    x' = 2

    x'' = 1

    Alternative A.
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