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January 30, 2015

January 30, 2015

Posted by **nice** on Wednesday, March 13, 2013 at 8:46am.

- math -
**Reiny**, Wednesday, March 13, 2013 at 11:08amTo have one real root, the discriminant must be zero

(a-15)^ - 4(25)(9) = 0

(a-14)^2 = 900

a-15 = ± 30

a = 15 ± 30

a = 45 or a = -15

so the sum of the a's = 45-15 = 30

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