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y + 4 = (x + 3)² - 9
y + 13 = (x+3)²
√(y + 13) = x + 3
x = √(y + 13) - 3
f^-1(x) = √(x + 13) - 3
f^-1(3) = √(3+13) - 3
= √16 - 3
= 4 - 3
= 1