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= 1/(x + 3) + 2/(x + 3)
= 3/(x + 3)
b. 5/(x + 2) + 5/(x - 2)
= [5(x - 2) + 5(x + 2)]/(x² - 4)
= 10x/(x² - 4)
--- + ------ = -------------------------- = -------------
x+3 2x+6 2x^2 +6x+6x+18 2x^2+12x+18
5 5 5x-10 + 5x+10 10x
------ + -------= ------------------------ =---------------
x+2 x-2 x^2 -2x+2x -4 x^2-4