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What is the value of b+c if x^2+bx+c>0 only when x is (-inf, -2) U (2, inf)?

 

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 Jun 27, 2022
 #1
avatar+124676 
+1

The parabola tuurs upward and  has roots at   x = -2  and  x = 2

 

So  we have

 

(x + 2) (x - 2) > 0

 

x^2 - 4  > 0

 

b =  0

 

c =  -4

 

b + c =  0 - 4  =  -4

 

 

 

cool cool cool

 Jun 27, 2022

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