We use cookies to personalise content and advertisements and to analyse access to our website. Furthermore, our partners for online advertising receive pseudonymised information about your use of our website. cookie policy and privacy policy.
 
+0  
 
0
133
1
avatar+23 

The quadratic equation $2x^2 + bx + 18 = 0$ has a double root. Find all possible values of $b.$

 Jan 26, 2019
 #1
avatar+99415 
+1

2x^2 + bx + 18  =  0

 

If this has a double root......the discriminant will = 0

 

b^2   - 4(2)(18)  = 0

 

b^2 - 144 = 0

 

b^2 = 144            take both roots

 

b = 12    or  b =   -12

 

 

cool cool cool

 Jan 26, 2019

14 Online Users

avatar
avatar
avatar