Question 536804
The denominators are a-5 and a+5



Since they have nothing in common (except the factor of 1), this means that the LCM of a-5 and a+5 is {{{(a-5)(a+5)}}}



So the LCD is {{{(a-5)(a+5)}}}



Optionally, you can FOIL that out, but I don't think it's necessary.



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