The discriminant of the quadratic equation is
(a)D=0
(b)D=b2-4ac
(c)D=b2+4ac
(d)D=b/4ac
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b. b^2 - 4ac is the answer
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The discriminant is the expression b2 - 4ac, which is defined for any quadratic equation ax2 + bx + c = 0. Based upon the sign of the expression, you can determine how many real number solutions the quadratic equation has. ... If you get a negative number, the quadratic will have no real solutions, just two imaginary ones.
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