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2.1.0: Extracting Square Roots and Completing the Square (Review)
https://math.libretexts.org/Courses/Highline_College/Math_141%3A_Precalculus_I_(old_edition)/02%3A_Inequalities_and_Functions/2.01%3A_Equations_and_Inequalities/2.1.00%3A_Extracting_Square_Roots_and_Completing_the_Square_(Review)
Quadratic equations can have two real solutions, one real solution, or no real solution—in which case there will be two complex solutions.
6.1: Extracting Square Roots and Completing the Square
https://math.libretexts.org/Bookshelves/Algebra/Advanced_Algebra/06%3A_Solving_Equations_and_Inequalities/601%3A_Extracting_Square_Roots_and_Completing_the_Square
Quadratic equations can have two real solutions, one real solution, or no real solution—in which case there will be two complex solutions.

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