+0  
 
0
419
1
avatar+272 

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?

 Oct 23, 2017
 #1
avatar+98125 
+1

 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

 Oct 23, 2017

8 Online Users

avatar