
To find: The solution set for the given inequality.

Answer to Problem 19E
Solution set:
(−3,2) .
Explanation of Solution
Given information:
An inequality is given as - x2+x<6 .
Concept used:
Key numbers of a polynomial are its zeros. Real zeros of a polynomial divides real line into intervals in which the polynomial does not change its sign. A test value is taken from each interval and corresponding value of inequality is calculated (whether positive or negative). The inequality maintains same sign for whole interval.
Calculation:
Given inequality is - x2+x<6
⇒x2+x−6<0⇒x2+3x−2x−6<0⇒(x+3)(x−2)<0
Key numbers are −3,2 .
Test interval | Test x− value | Polynomial value x2+x−6<0 | Conclusion |
(−∞,−3) | x=−4 | (−4)2+(−4)−6=6 | Positive |
(−3,2) | x=0 | 02+0−6=−6 | Negative |
(2,∞) | x=5 | (5)2+(5)−6=24 | Positive |
From above table, it can be concluded that inequality is satisfied in the open interval (−3,2) .
Hence, solution set for the given inequality will be (−3,2) .
Graph of the solution set is drawn below.
Chapter 2 Solutions
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