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15 August, 11:22

Use the discriminant to determine how many and what kind of solutions the quadratic equation x2-x=-14 has.

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  1. 15 August, 11:47
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    see explanation

    Step-by-step explanation:

    Given a quadratic equation in standard form : ax² + bx + c = 0 (a ≠ 0)

    Then the discriminant Δ = b² - 4ac determines the type of solutions

    • If b² - 4ac > 0 then roots are real and distinct

    • If b² - 4ac = 0 then roots are real and equal

    • If b² - 4ac < 0 then roots are not real

    Given

    x² - x = - 14 (add 14 to both sides)

    x² - x + 14 = 0 ← in standard form

    with a = 1, b = - 1, c = 14

    b² - 4ac

    = ( - 1) ² - (4 * 1 * 14) = 1 - 56 = - 55

    Since b² - 4ac < 0 then roots are not real
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