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2 cards from this section. Quick, good the night before a test.
Solve and graph x² < 4.
What happens when x equals 2 and -2?
Graph the inequality x² + 4x + 3 > 0.
Which side of the roots are positive?
What does the positive region of a parabola represent in a quadratic inequality?
Think about what positivity means for a quadratic expression.
In the inequality ax² + bx + c ≤ 0, what can you say about a parabola with no real roots?
Recall what the discriminant indicates.
Solve the inequality x² - 4x + 4 and graph. Discuss what your graph tells you.
What does a flat point indicate about positive or negative values?
Analyze the inequality -3x² + 12x - 9 > 0 and find the shaded region if applicable.
Where does the parabola point with respect to the x-axis?
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