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x- 2 = y
x = y - 2
f(y) = (y-2)² + 4(y-2) - 1
f(x) = (x-2)² + 4(x-2) - 1
f(x) = x² - 4x + 4 + 4x - 8 - 1
f(x)= x² - 5