# math

1. You have listed three "rational algebraic expressions", not one.

Note that
(x+1)/(x^2+5x+6) = 1/(x+5)
and
2x/(x^2-4) = 2x/[(x+2)(x-2)]

If you really want a least common denominator, it would be
[x+2)(x-2)(x+5)

posted by drwls

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