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y = x² - 6x + 5
y - 5 = x² - 6x
dijadikan kuadrat sempurna
y - 5 + 9 = x² - 6x + 9
y + 4 = x² - 6x + 9
y + 4 = (x - 3)²
(x - 3)² = y + 4
x - 3 = √(y+4)
x = 3 + √(y+4)
f⁻¹(x) = 3 + √(x+4)