- #1
nate808
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I am having problems with finding the domain of the composition of f and g(fog) for example, f(x)=x+7 and g(x)=x^2+4, the fog(x)=x^2+11, but from there i don't know how to find the domain, please help
"f o g" represents the composition of two functions, f and g. This means that the output of g serves as the input for f, and the resulting output is the final result.
To find the domain of f o g, we need to consider the domains of both f and g. The domain of f o g will be the set of all inputs that are in the domain of g and produce outputs that are in the domain of f.
Sure, let's say f(x) = √x and g(x) = x + 3. To find the domain of f o g, we first need to determine the domain of g, which is all real numbers since there are no restrictions on the input. Next, we need to find the domain of f, which is all non-negative real numbers (since the square root function only accepts non-negative inputs). Therefore, the domain of f o g would be all real numbers greater than or equal to -3.
Yes, there is a general rule for finding the domain of f o g. If we have two functions f(x) and g(x), the domain of f o g will be the set of all inputs that are in the domain of g and produce outputs that are in the domain of f.
If the domains of f and g do not overlap, then there will be no inputs that satisfy both domains. This means that there is no solution for f o g and the domain would be an empty set.