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Overview: 1 questions will be solved this time.Among them
☆1 inequalities
[ 1/1Inequality]
Assignment:Find the solution set of inequality -(7*k+2)-sqrt((2+7*k)^2-4+28*k) <0 .
Question type: Inequality
Solution:
The inequality can be reduced to 1 inequality:
-( 7 * k + 2 ) - sqrt ( ( 2 + 7 * k ) ^ 2 - 4 + 28 * k ) <0 (1)
From the definition field of √
( 2 + 7 * x ) ^ 2 - 4 + 28 * x ≥ 0 (2 )
From inequality(1):
k > -0.050607
From inequality(2):
k ≤ -8/7 或 k ≥ 0
From inequalities (1) and (2)
k ≥ 0 (3)
The final solution set is :
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