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Help I dont know how to solve quadratic equation

 

Find the value of $v$ such that $\frac{-21-\sqrt{201}}{10}$ a root of $5x^2+21x+v = 0$.

 Sep 7, 2023
 #1
avatar+129690 
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\(\frac{-21-\sqrt{201}}{10}\)

 

5x^2 + 21x  + v  =  0 

 

The discriminant = 201    ....so...

 

21^2  - 4 (5) (v)   = 201

 

441  - 20v  =  201

 

20 v = 441  - 201

 

20v =  240

 

v = 240  /  20   =    12

 

cool cool cool

 Sep 7, 2023

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