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Help find the domain of the following function.?
f= { (-1,3), (0,0), (1,2), (2,8), (3,6) }
and also this one..
g(x)=x/(x^2 -3x-4)
Many thanks for any help. =)
1 Answer
- ?Lv 71 decade agoFavorite Answer
For the first function, domain is simply the set of all x-coordinate. So,
D = {-1, 0, 1, 2, 3}
For the second one, it's easier to find the restriction and then take them away from all real number. Since the domain of the rational expression cannot have values that makes it undefined, that is 0 in the denominator, simply take the denominator set it equal to 0 and solve to find the restriction. So,
x^2 - 3x - 4 = 0. Solving for x, we get -1 and 4 as our restriction. The domain is all real number except for these values, that is R - {-1, 4}