If a=2 , b = -1 , c = 15 find the value of
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b²- 4ac > 0 , then roots of quadratic equation are real and unequal.
b²-4ac = 0 , then the roots of quadratic equation are real and equal.
b² - 4ac < 0 , then the roots are not real (i.e. imaginary roots).
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