Question 5 • Precalculus
To check that the functions are inverses, substitute each function into the other. Since h(x)=−(x+72)³, g(h(x))=∛((x+72)³)−72=x. In the other order, h(g(x))=−(∛(−x)−72+72)³=−(∛(−x))³=x. Choice D gives these two expressions, so both compositions simplify to x.
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