Determine whether each function is even, odd, or neither. See Example 5. ƒ(x)=x3-x+9
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Graphs and Coordinates
Problem 77a
Textbook Question
List the quadrant or quadrants satisfying each condition. x3 > 0 and y3 <0
Verified step by step guidance1
Understand the problem: We are tasked with identifying the quadrant(s) where the conditions x^3 > 0 and y^3 < 0 are satisfied. Recall that the Cartesian plane is divided into four quadrants, and the signs of x and y in each quadrant determine the conditions.
Analyze the condition x^3 > 0: The cube of x is positive when x itself is positive. This means x > 0. On the Cartesian plane, x > 0 corresponds to Quadrants I and IV.
Analyze the condition y^3 < 0: The cube of y is negative when y itself is negative. This means y < 0. On the Cartesian plane, y < 0 corresponds to Quadrants III and IV.
Combine the conditions: For both conditions to be true simultaneously, we need a quadrant where x > 0 and y < 0. From the analysis, this occurs in Quadrant IV.
Conclude the solution: The quadrant that satisfies the conditions x^3 > 0 and y^3 < 0 is Quadrant IV.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Quadrants of the Cartesian Plane
The Cartesian plane is divided into four quadrants based on the signs of the x and y coordinates. Quadrant I has both x and y positive, Quadrant II has x negative and y positive, Quadrant III has both x and y negative, and Quadrant IV has x positive and y negative. Understanding these quadrants is essential for determining where specific conditions hold true.
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Inequalities and Their Solutions
Inequalities express a relationship where one side is not equal to the other, often involving greater than (>) or less than (<) symbols. In this case, x^3 > 0 indicates that x must be positive, while y^3 < 0 indicates that y must be negative. Solving these inequalities helps identify the values of x and y that satisfy the given conditions.
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Cubic Functions and Their Behavior
Cubic functions, such as f(x) = x^3, exhibit specific behaviors based on the sign of x. For positive x, the output is positive, and for negative x, the output is negative. This characteristic is crucial for understanding the conditions x^3 > 0 and y^3 < 0, as it directly influences the signs of x and y in the context of the quadrants.
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