|_let f(x) = 2* and g(x) = x-2. the graph of (f•g)(x) is shown below.
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what is the domain of (f•g)(x),

First step is to get rid of the square root. remember that a square root is the same as raising to the (1/2) power. see below: multiply exponents per exponent rules to get: remember you subtract exponents from the denominator and add exponents in the numerator so: simplify further: so a is the correct choice. if you don't understand this google exponent rules and it will you understand. look at the image results.