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For which intervals is the function negative?

Select each correct answer.

 

(−∞,−3)

(−1.5, 4.2)

(−3,1)

(1,4)

(4,∞)

(−2.5,2.5)

 

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 Jun 14, 2018
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I understand that it's not (−3,1) or (4,∞), but I don't know if the rest are ALL the correct answers :'-(

 Jun 14, 2018

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