This season, I will students to use completing squares for solving grade and not general formula. This has great advantages: 1) it's more accessible (just multiply by 4a and complete the squares) and 2) quadratic functions associated with it has a real meaning of parameters and 3) finding vertex is easier and has a meaning.

Overall, you have to solve first grade equations to solve second grade. It implies a review of previous topics. Applying the formula has no this.

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@somenxavier it's also going to help them later when they start integrating things with quadratic polynomials in them.

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