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f(-3) = {2(3) -1}³ - 4
f(-3) = 5³-4 = 121
gof(-3) = g {f(-3)} = g(121) = 1/2 ∛(x+4) + 1/2
gof(-3) = 1/2 ∛(121+4) + 1/2
gof(-3) = 1/2 ∛125 + 1/2
gof(-3) = 1/2 (5) + 1/2 = 5/2 + 1/2
gof(-3) = 3