The quadratic function y = x² + 2x - 1 expressed in vertex form is _______
A. y = (x + 1)² + 1
B. y = (x + 1)² - 2
C. y = (x + 1)² + 2
D. y = (x + 1)² - 1
A. y = (x + 1)² + 1
B. y = (x + 1)² - 2
C. y = (x + 1)² + 2
D. y = (x + 1)² - 1
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