The whole focus of quadratics is to solve equations with them.  This, in its simplest form, presents equations like x² = 36 that can simply be solved by finding the square route of both sides and ending up with x = ±6.  When you find the square route of the number in this type of equation, the value, 6, is made ±.  This type of solving qualifies as quadratic, but it really is more involved with radicals.  The four main types of solving quadratics are:

Isolating the squared term and finding the square route of both sides (above).

Setting the equation to zero and factoring the leftovers.

Making one side of the equation a perfect square and finding the square route of both sides by completing the square.

After deriving the formula from ax² + bx + c = 0, setting a quadratic equal to zero and plugging the a, b, and c terms of the quadratic into the Quadratic Formula.

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