 |  Elementary and Intermediate Algebra Mark Dugopolski,
Southeastern Louisiana University
Quadratic Equations, Functions, and Inequalities
Key Terms
| completing the square | Finding the third term of a perfect square trinomial when given the first two.
| | | | | composition of functions | A function formed by using the output of one function as the input of a second function.
| | | | | discriminant | The discriminant is the expression found under the radical sign in the quadratic formula.
| | | | | quadratic equation | An equation that can be written in the form ax2 + bx + c = 0, where a is not equal to 0.
| | | | | quadratic formula | The formula that can be used to solve a quadratic equation.
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| | | | | quadratic function | A function of the form f(x) = ax2 + bx + c when a ≠ 0.
| | | | | quadratic in form | An equation that is quadratic after a substitution.
| | | | | quadratic inequality | An inequality of the form ax2 + bx + c ≤ 0 (or with any of the other inequality symbols) where a ≠ 0.
| | | | | sign array | A matrix of plus and minus signs used in computing a determinant.
| | | | | sign graph | A number line showing the signs of factors.
| | | | | test point | A number that is used to check if an inequality is satisfied.
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2002 McGraw-Hill Higher Education