Question 91935
find the LCD for -5/x^2t and x/t^3

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The LCD must contain each of the factors of the denominator in its highest
power.

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You have 
x^2 in the denominator  so there must be an x^2 factor
you have t and t^3 so there must be a t^3
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The LCD is x^2t^3
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Cheers,
Stan H.