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Can someone please send me the answer of this question?its from CBSE grade 10

Can someone please send me the answer of this question?its from CBSE grade 10 
 

Question Image
Grade:10

1 Answers

Arun
25763 Points
3 years ago
Dear student

x² + kx +64 = 0
Hence D>= 0
k² >= 256
(k-16) (k +16) > = 0
K belongs to ( - infinity , -16) U ( 16, infinity)
Now
x² - 8x + k =0
64> = 4k
k
Hence
On combining both the results
K bemongs to ( - infinity , -16)
Regards
Arun (askIITians forum expert)

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