Back to 10.5 Graphing Quadratic Equations in Two Variables

10.5 Exercise 9

Avg difficulty 2.5

Determine whether each parabola opens upward or downward:

ⓐ $y = −2 x^{2} - 2 x - 3$ ⓑ $y = 5 x^{2} - 2 x - 1$

OpenStax Elementary Algebra 2e, 10.5 Graphing Quadratic Equations in Two Variables, exercise 9

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Adapted from Elementary Algebra 2e © 2020 Rice University. Licensed under CC BY 4.0. Source: Elementary Algebra 2e. Imported at revision 77a933c.