Question 1 • Mathematics III
For (m ∘ n)(x), substitute n(x) = x − 3 into m(x) = (x + 5)/(x − 1). This gives (x + 2)/(x − 4), which is undefined when x = 4, so its domain is all real numbers except 4. Choice A, h(x) = 11/(x − 4), has the same domain.
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