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y = x² - 4x + 4 - 4 + 9 (kuadrat sempurna)
y = (x² - 4x + 4) - 4 + 9
y = (x - 2)² + 5
y - 5 = (x - 2)²
√ (y - 5) = x - 2
( √ ( y - 5) ) + 2 = x
Jadi inversnya