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23 February, 10:02

Find the number of real number solutions for the equation. x^2+5x+7=0

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  1. 23 February, 10:22
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    Use the discriminant to determine the number and types of solutions to a quadratic equation.

    The discriminant is the value b^2 - 4ac when the quadratic is in standard form: ax^2 + bx + c = 0

    If the discriminant is a positive perfect square, you have 2 real rational roots (solutions).

    If the discriminant is a positive number that is not a perfect square, you will have 2 real irrational roots (solutions).

    If the discriminant is a negative number, you have 2 complex solutions, NO real roots (solutions)

    If the discriminant is zero, you have 1 real rational root (solution). Also called a double root.

    b^2 - 4ac = 5^2 - 4*1*7 =

    25 - 28 = - 3

    NO real solutions
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