SOLUTION: kČ+10k+9 is <0 Find the range of K. Thanks in advance.

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Question 32904: kČ+10k+9 is <0
Find the range of K. Thanks in advance.
Answer by sarah_adam(201) About Me  (Show Source):
You can put this solution on YOUR website!
kČ+10k+9 is <0
kČ+9k+k+9<0
k(k+9)+ (k+9)<0
(k+1)(k+9)<0
(k+1)<0 or (k+9)<0
therfore k< -1 or k< -9
range of k is in between -9 and -1
-9 < k < -1