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y = (x - 3)² + 1
y - 1 = (x - 3)²
(x - 3)² = y - 1
x - 3 = √(y - 1)
x = 3 + √(y - 1)
f(x) = 3 + √(y - 1)
y = 2x² - 8
y + 8 = 2x²
2x² = y + 8
x² = (y+8)/2
x = √{(y+8)/2}
f(x) = √{(y+8)/2}