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December 20, 2014

December 20, 2014

Posted by **ayan** on Friday, March 15, 2013 at 8:10am.

- math -
**black_widow**, Saturday, March 16, 2013 at 12:39amLet 25x^2+(a−15)x+9=0

Discriminant B^2-4AC=0 (only one distinct root)

(a-15)^2-4(25)(9)=0

(a-15)^2=900

a=15+30 or a=15-30

a=45 a=-15

therefore sum of a =45+(-15)

a =30

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