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The value of 5/(9x^2 + 6x + 11) is maximum when x=?



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9 x^2 + 6x + 11 should be minimum

mukushla
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6
take derivative

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I dont think so

waterineyes
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You should take derivative first..

mukushla
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6
or complete the squre for 9 x^2 + 6x + 11

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18 x + 6

mukushla
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well so x=2 will minimize 9 x^2 + 6x + 11 and consequencly will maximize
5/9 x^2 + 6x + 11

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hw u got x = 2

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The answer should be x = 1/3

mukushla
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sorry 18 x + 6=0 then x=1/3

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got it thxxx

Pac1f1cIslander
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Why was I sent this in a message? xD

robtobey
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A plot of 5/(9x^2 + 6x + 11) and it's derivative, in blue and red respectively, is attached.