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Thread: SAT question Quadratic equation

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  1. #1
    Junior Member
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    Jun 2013
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    SAT question Quadratic equation

    Which of the following is equal to the number of roots having the quadratic equation ?

    (A)
    (B)
    (C)
    (D)
    (E)

    Thanks!
    Last edited by lily; 12-27-2013 at 05:28 AM.

  2. #2
    Quote Originally Posted by lily View Post
    Which of the following is equal to the number of roots having the quadratic equation ?

    (A)
    (B)
    (C)
    (D)
    (E)

    Thanks!
    This is an easy SAT question using GDC and find the roots of the given quadratic equation.
    Another way is to recognize the identity and thus the equation has one double (repeated) root.
    One more way to find the correct answer is to calculate the discriminant , therefore the equation has only one double root.
    Therefore the correct answer is (B).

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