Math Problem Statement
Which inequality below is represented by the following graph:
A. y≥−2x2+6x+8 B. y<2x2−8x+8 C. y>2x2−8x−8 D. y≤2x2−8x−8
Solution
To determine which inequality is represented by the graph, let's analyze the features of the graph first.
Analysis of the Graph:
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Parabolic Shape: The graph shows a parabola that opens upwards. The shaded region is above the parabola, which suggests an inequality involving "greater than or equal to" (≥) or "greater than" (>).
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Vertex of the Parabola: From the graph, the vertex of the parabola appears to be around .
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Shading: Since the shaded area is outside (above) the parabola, we are looking for an inequality with "greater than" (y > or y ≥).
Determining the Correct Inequality:
Now, let's evaluate each option:
A. y ≥ -2x² + 6x + 8:
- This option suggests a parabola that opens downward (negative coefficient for ).
- Since the parabola in the graph opens upwards, this option is incorrect.
B. y < 2x² - 8x + 8:
- This option suggests shading below a parabola that opens upwards (positive coefficient for ).
- The shading in the graph is above the parabola, so this option is incorrect.
C. y > 2x² - 8x - 8:
- This option suggests shading above a parabola that opens upwards (positive coefficient for ).
- The graph shows shading above the parabola, so this option is correct.
D. y ≤ 2x² - 8x - 8:
- This option suggests shading below a parabola that opens upwards.
- The graph shows shading above the parabola, so this option is incorrect.
Conclusion:
The correct answer is C. y > 2x² - 8x - 8.
Would you like more details or have any questions?
Here are 5 related questions that might interest you:
- How do you determine the vertex of a parabola from its equation?
- What are the differences between the inequalities involving parabolas (>, ≥, <, ≤)?
- How does the coefficient of affect the direction in which a parabola opens?
- How can we find the axis of symmetry for a given parabolic equation?
- How would the graph change if we altered the constants in the quadratic expression?
Tip: When analyzing graphs of inequalities, always pay attention to the direction of shading to determine the correct inequality.
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Math Problem Analysis
Mathematical Concepts
Quadratic Equations
Inequalities
Graph Analysis
Formulas
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Theorems
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Suitable Grade Level
Grades 9-12