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How do you find the domain in interval notation for #f(x)=(x+4)/(x^2-4) #?

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May 30, 2015

#f(x)=(x+4)/(x^2-4)#

#f(x)=(x+4)/color(red)[(x)^2-(2)^2]#

#f(x)=(x+4)/color(red)[(x+2)(x-2)]# #lArr (a)^2-(b)^2=(a+b)(a-b)#

#x# can not be #-2# or #2#, otherwise #f(x)=oo#

Domain:
#x in RR# except #-2# and #2#.

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