![]() No matter which method you use, the quadratic formula is available to you every time. Then use a different method to check your work. Keep track of your signs, work methodically, and skip nothing. It may interest you to know that the completing the square process for solving quadratic equations was used on the equation ax 2 + bx + c = 0 to derive the quadratic formula.Comparing our example, x 2 + 5 x + 6 = 0 b 2 will always be a positive value. There is no solution in the real number system.
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