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For two real values of n, the equation 9x^2+nx+36=0 has exactly one solution in x. What is the positive value of n?

WhichWitchIsWhich  Oct 23, 2017
 #1
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 9x^2+nx+36=0

 

If this has only one [ double root ] solution......the discriminant will = 0

 

So

 

n^2  - 4(9)(36) =  0

n^2 - 36^2  = 0

n^2  = 36^2

n = 36

 

 

cool cool cool

CPhill  Oct 23, 2017

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