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I have been struggling for a whole week

 

 Sep 7, 2020
 #1
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+1

F/g = 1  / ( x (sqrt(x+3))    So you SHOULD be able to see x cannot = 0

    And  x has to be greater than -3   because the sqrt would be neg if less than  -3    or zero if equal to -3 (zero in denominator not allowed)    

 

 

so domain x = (-3, 0)  U  (0, +inf)      Does not include -3     or 0   And goes to inf

 Sep 7, 2020

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