Monday

October 20, 2014

October 20, 2014

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

**Answer this Question**

**Related Questions**

algebra - What is the sum of all the possible values of a for which 25x^2+(a&#...

Algebra - What is the sum of all the possible values of a for which 25x^2 + (a-...

Algebra - What is the sum of all the possible values of a for which 25x^2 + (a-...

math - What is the sum of all the possible values of a for which 25x2+(a−...

Math (Algebra) - If a is a real number and a cubic equation f(x) = x^3 − ...

Math (Quadratics)(Discriminants) - If a is a real number and a cubic equation f(...

Algebra - If a is a real number and a cubic equation f(x)=x^3−12x^2+(a+20)...

math - What is the sum of all possible real values of x, such that there exists ...

math - x and y are real numbers that satisfy the equations x2+y2=125 and x+y=13...

math (please help!) - What is the sum of all the constants k such that |x^2&#...