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Find the sum of all possible positive integer values of b such that the quadratic equation 2x^2 + 15x + b = 0 has rational roots.

 Feb 2, 2022
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Discriminant of Quadratic Formula

\(x = {-b \pm \sqrt{b^2-4ac} \over 2a}\)

 

b^2 - 4ac  >=0

15^2 - 4(2)(b) >= 0

225 >= 8b

28.125 >= b                 sum = 28 + 27 + 26.......1 = 406    for positive integers

 Feb 2, 2022
edited by ElectricPavlov  Feb 2, 2022

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