0
x² + 3x - 1
= [ x² + 3x + (3/2)²] - 1 - (3/2)²
= (x + 3/2)² - 1 - (9/4)
= (x + 3/2)² - (13/4)
if you are still confused, i want you to follow the related link that explains the concept of completing the square clearly.
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