SOLUTION: interval does increase y=x^4+4x

SOLUTION: interval does increase y=x^4+4x

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Question 765891: interval does increase y=x^4+4x
Answer by tommyt3rd(5050) (Show Source): You can put this solution on YOUR website!

when x=-2

so y decreases on (-oo, -1)
and thus increases on (-1,oo)

:)
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