SOLUTION: This is actually for QUADRATIC FORMULA, NOT QUADRATIC EQUATION Solve by completing the square 2x^2 + 11x - 1 = 0 The solution set is { }

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First add to both sides

Now divide both sides by

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In order to complete the square, take
1/2 of the coefficient of the term,
square it, then add it to both sides
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Take the square root of both sides


and

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check:







OK
You can check other root