Fungsi invers f(x) = x² + 2x + 3 Tolong dijawab?

Bab Fungsi
Matematika SMA Kelas X

f(x) = x² + 2x + 3
y = x² + 2x + 3
y - 2 = x² + 2x + 3 - 2
y - 2 = x² + 2x + 1
y - 2 = (x + 1)²
(x + 1)² = y - 2
x + 1 = √(y - 2)
x = -1 +- √(y - 2)
f(x)⁻¹ = -1 +- √(x - 2)

f(x)⁻¹ = -1 + √(x - 2)

atau

f(x)⁻¹ = -1 - √(x - 2)