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Solution of an inequality

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Solution of an inequality [#permalink]

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New post 24 Jun 2013, 21:55
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Responding to a pm:

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4/k >=-2/3? the complete solution to this inequality is k>0 or k<=-6. i got only k<=-6. how k>0???



When dealing with inequalities, it matters whether the variable is positive or negative.
If variable is positive, you can cross multiply the way you usually do.
If variable is negative, you need to flip the sign when you cross multiply.

4/k >= -2/3
You will take 2 cases:

CAse 1: k > 0 (k is positive)
4/k >= -2/3
4 >= -2k/3
k >= - 6
Since k must be positive, hence this is true for all k > 0

Case 2: k < 0 (k is negative)
4/k >= -2/3
4 <= -2k/3
k <= -6

So you get two ranges k < -6 OR k > 0
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Re: Solution of an inequality [#permalink]

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New post 01 Oct 2017, 06:32
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Kudos [?]: 273 [0], given: 0

Re: Solution of an inequality   [#permalink] 01 Oct 2017, 06:32
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