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1 November, 10:12

Find the value of the discriminant. Then describe the number and type of roots for the equation. x2 + x + 7 = 0

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  1. 1 November, 10:37
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    The value of the discriminate is - 27 and there are 2 complex roots

    Step-by-step explanation:

    * Lets explain what is discriminant

    - The form of the quadratic equation is y = ax² + bx + c

    - The roots of the equation is the values of x when y = 0

    - There are three types of roots:

    # Two different real roots

    # One real root

    # No real roots or two complex roots

    - We can know the types of roots of the equation without solve it by

    using the discriminant which depends on the value of a, b, c

    - The discriminant = b² - 4ac, where a is the coefficient of x², b is the

    coefficient of x and c is the numerical term

    # If b² - 4ac > 0, then there are two different real roots

    # If b² - 4ac = 0, then there is one real root

    # If b² - 4ac < 0, then there is no real root (2 complex roots)

    * Lets solve the problem

    ∵ x² + x + 7 = 0

    ∴ a = 1, b = 1, c = 7

    ∵ The discriminant = b² - 4ac

    ∴ The discriminant = (1) - 4 (1) (7) = 1 - 28 = - 27

    ∵ - 27 < 0

    ∴ There is no real solution there are two complex roots

    * The value of the discriminate is - 27 and there are 2 complex roots
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