##### Question Info

This question is public and is used in 23 tests or worksheets.

Type: Multiple-Choice
Standards: HSF-IF.C.7, HSF-IF.C.7a
Author: nsharp1

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# Quadratic Equations and Expressions Question

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When graphing a quadratic function of the form $f(x) = ax^2 + bx + c$, the sign (positive or negative) of which of the following values indicates whether the function opens upwards or downwards?
1. $4ac$
2. $b^2$
3. $c$
4. $a$