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

 Jun 30, 2021
 #1
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If we  have a double root , the disctiminant =   0      ....so......

 

b^2  - 4 * 2 * 2  =   0

 

b^2  -  16  =   0

 

b^2  =  16      take both roots

 

b = -4      and  b =  4

 

 

cool cool cool

 Jun 30, 2021

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