Unformatted text preview: in x is given by: ax 2 + bx + c = , where a ± , and a , b , and c are real coefficients. Its solutions are given by the Quadratic Formula : x = ± b ± b 2 ± 4 ac 2 a • Sometimes, the solutions are not real, but imaginary (see Section 2.1.) WARNING 2 : Make sure the fraction bar in the formula goes all the way across. The formula is not : x = ± b ± b 2 ± 4 ac 2 a . WARNING 3 : Here, the plus-minus sign ± indicates that we take both the result from the “+” case and the result from the “ ± ” case. (The results are equal ± b 2 ± 4 ac = .) Sometimes in precalculus, the ± sign indicates that we do not yet know which sign to take. We also use the Factoring Method, the Square Root Method, and the Completing the Square (CTS) Method to solve quadratic equations....
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This document was uploaded on 12/29/2011.
- Spring '09