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Hamburger · Answer 1 · 2018-03-15T02:36:36+0000

Completing the square:
Divide the middle term by 2, and square the number.

x² + 11x + (11/2)² - (11/2)² = 3
x² + 11x + (11/2)² = 3 + (11/2)²
x² + 11x + 121/4 = 3 +121/4
x² + 11x + 121/4 = 133/4

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