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Verified answer
F(x) = x - 3a) f-¹ (x)
f(x) = x - 3
y = x - 3
x = y + 3
f-¹(x) = x + 3
b) f-¹(-2) = (-2) + 3 = 1
f-¹(4) = 4 + 3 = 7