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What interval consists of all u such that neither 2u nor -20u is in the interval (-infinity, -1) ?

 May 13, 2022
 #1
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The answer is (-1/20, 1/2).

 May 13, 2022
 #2
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But isn't -20*1/2=-10? That falls into the interval, which we don't want.

idontknowhowtodivide  May 13, 2022
 #3
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I got the answer as [-1/2, 1/20]. 

 May 13, 2022

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