How do you find the domain of f(x) = (x^2 - 1)/( x +4)?

1 Answer
Jim G.
Nov 14, 2017

x inRR,x!=-4

Explanation:

"the denominator of "f(x)" cannot be zero as this would"
"make "f(x)" undefined"

"equating the denominator to zero and solving gives"
"the value that x cannot be"

"solve "x+4=0rArrx=-4larrcolor(red)"excluded value"

"domain is "x inRR,x!=-4

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