Answer to Question #18849 in Trigonometry for Garrett Krisko
D = 4² - 4*a*2 = 16-8a
The roots of this equation are real, rational and equal only if discriminant D is equal to zero:
D = 0 <==> 16-8a = 0 <==> a = 2.
So, the roots are real, rational and equal when a has a value of 2.
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