That depends how you plan to solve it - there are several methods. But usually you would start by arranging the equation in "standard form", meaning that on the right of the equal sign, you only have zero.
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The equation must be written such that the right side is equal to zero. And the resulting equation must be a polynomial of degree 2.
You'll typically use it when solving a quadratic equation - when factoring isn't obvious.
No, it must have two answers.
If the discriminant of the quadratic equation is less than zero then it has no real solutions
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