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avatar+16 

pls answer.

 May 22, 2024
 #1
avatar+129713 
+1

Rearrange as

 

4x^2 + kx + 9   =  0

 

Will have non-real roors when the  discriminant  < 0

 

k^2  - 4 * 4 * 9 < 0

 

k^2  - 144 < 0

 

k^2  < 144

 

This will be true when k is on the interval ( -12 , 12)

 

cool cool cool

 May 23, 2024

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