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Example Questions
Example Question #121 : Quadratic Functions
Which of the following graphs correctly represents the quadratic inequality below (solutions to the inequalities are shaded in blue)?
To begin, we analyze the equation given: the base equation, is shifted left one unit and vertically stretched by a factor of 2. The graph of the equation is:
To solve the inequality, we need to take a test point and plug it in to see if it matches the inequality. The only points that cannot be used are those directly on our parabola, so let's use the origin . If plugging this point in makes the inequality true, then we shade the area containing that point (in this case, outside the parabola); if it makes the inequality untrue, then the opposite side is shaded (in this case, the inside of the parabola). Plugging the numbers in shows:
Simplified as:
Which is not true, so the area inside of the parabola should be shaded, resulting in the following graph:
Example Question #1 : Graphing Circular Inequalities
Find an inequality for points on a graph that fall on or inside of a circle centered at with a radius of , as shown below.
The equation for a circle centered at point with radius is . Our circle is centered at with , and we are interested in points that lie along or inside of the circle. This means the left-hand side must be less than or equal to the right-hand side of the equation. We are left with or
Example Question #1 : Graphing Circular Inequalities
Given the above circle inequality, which point is not on the edge of the circle?
This is a graph of a circle with radius of 5 and a center of (1,1). The center of the circle is not on the edge of the circle, so that is the correct answer. All other points are exactly 5 units away from the circle's center, making them a part of the circle.
Example Question #521 : Functions And Graphs
Given the above circle inequality, does the center satisfy the equation?
Yes
No
Maybe
Can't tell
No
The center of the circle is , so plugging those values in for x and y yields the response that 0 is greater than or equal to 25.
Since plugging in the center values gives us a false statement we know that our center does not satisfy the inequality.
Example Question #1 : Graphing Circular Inequalities
Given the above circle inequality, is the shading on the graph inside or outside the circle?
Can't Tell
Outside
Inside
Both
Outside
Check the center of the circle to see if that point satisfies the inequality.
When evaluating the function at the center (1,1), we see that it does not satisfy the equation, so it cannot be in the shaded region of the graph.
Therefore the shading is outside of the circle.
Example Question #1 : Graphing Circular Inequalities
Given the above circle inequality, which point is not on the edge of the circle?
This is a graph of a circle with radius of 6 and a center of (-2,4). The point (2,2) is not on the edge of the circle, so that is the correct answer. All other points are exactly 6 units away from the circle's center, making them a part of the circle.
Example Question #1 : Graphing Circular Inequalities
Given the above circle inequality, which point satisfies the inequality?
The left side of the equation must be greater than or equal to 36 in order to satisfy the equation, so plugging in each of the values for x and y, we see:
Therefore only yields an answer that is greater than or equal to 36.
Example Question #1 : Graphing Circular Inequalities
Given the above circle inequality, does the center satisfy the equation?
Can't tell
Maybe
No
Yes
No
The center of the circle is , so plugging those values in for x and y yields the response,
Therefore, the center does not satisfy the inequality.
Example Question #1 : Graphing Circular Inequalities
Given the above circle inequality, is the shading on the graph inside or outside the circle?
Inside
Both
Can't tell
Outside
Outside
Check the center of the circle to see if that point satisfies the inequality. When evaluating the function at the center (-2,4), we see that it does not satisfy the equation, so it cannot be in the shaded region of the graph. Therefore the shading is outside of the circle.
Example Question #1 : Graphing Circular Inequalities
Given the above circle inequality, which point is not on the edge of the circle?
Recall the equation of a circle:
where r is the radius and (h,k) is the center of the circle.
This is a graph of a circle with radius of 2 and a center of (-4,-3). The point (2,3) is not on the edge of the circle, so that is the correct answer.
All other points are exactly 2 units away from the circle's center, making them a part of the circle's edge.
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