21. Quadratic Functions (SC)
SOLVING QUADRATIC EQUATIONS Quadratic equations take the form .$/ +0$+ & = 0 where a, b and c are real numbers, a ≠ 0. When we solved a linear equation in x, we will have found the value of x that satisfied the equation. To solve the linear equation, we simply use the laws of basic algebra to isolate the unknown, for example, if 2$ − 1 = 7
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