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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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15y ago

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Q: Solve x squared plus 3x minus 1 by completing the square?
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