
ToSolve: The inequality 4x3−6x2<0 and graph the solution set.

Answer to Problem 29E
Thesolution set of the given inequality is (−∞,0)∪(0,32)
Graph of the solution set is
Explanation of Solution
Given:
The inequality 4x3−6x2<0
Concept Used:
Solving an inequality means, finding all the values of the variable for which inequality satisfy.
Calculation:
Given the inequality 4x3−6x2<0
Consider
4x3−6x2=0
4x3−6x2=02x2(2x−3)=0
That is
2x2=0 and 2x−3=0
x=0 and x=32
The key numbers are x=0 and x=32
The test intervals are (−∞,0) , (0,32) and (32,∞)
Evaluating the left side of the inequality (polynomial value) for a x−value in each test interval.
Test Interval | x−value | Polynomial Value | Conclusion |
(−∞,0) | x=−1 | 4x3−6x2=4(−1)3−6(−1)2=−4−6=−10 | Negative |
(0,32) | x=1 | 4x3−6x2=4(1)3−6(1)2=4−6=−2 | Negative |
(32,∞) | x=3 | 4x3−6x2=4(3)3−6(3)2=108−54=54 | Positive |
The inequality is satisfied for all the x−values in the interval (−∞,0) and (0,32) .
Therefore, the solution set of the given inequality is (−∞,0)∪(0,32)
Plotting all the points of the solutions set on the graph, we have:
Conclusion:
Thesolution set of the given inequality is (−∞,0)∪(0,32)
Graph of the solution set is
Chapter 2 Solutions
Precalculus with Limits
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