Question 119426
(3x+4x^2)/x^(-2/3) 
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Comment:  x^(-2/3) is a common denominator.
[3x/x^(-2/3)] + [4x^2/x^(-2/3)]

= [3x^(5/3)] + [4x^(8/3)]

= (x^(5/3))(3 + 4x)

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Cheers,
Stan H.