Can someone help me solve this problem?
Remember the notation that you showed (-9,9) is called interval notation
the parentheses tells us that the end points are not included
[ , ] <-- square brackets tell us that the end values are included
The first value in the interval notation is the start value, and the second number in interval notation is the end value
(-9, -9) is the set of all real numbers that are between -9, and 9 not including -9 and 9
-9<x < 9
or
x > -9 and x < 9
an inequality that will have these set of points as its solution set could be
x^2 - 81 < 0
or |x| < 9
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Answers & Comments
Remember the notation that you showed (-9,9) is called interval notation
the parentheses tells us that the end points are not included
[ , ] <-- square brackets tell us that the end values are included
The first value in the interval notation is the start value, and the second number in interval notation is the end value
(-9, -9) is the set of all real numbers that are between -9, and 9 not including -9 and 9
-9<x < 9
or
x > -9 and x < 9
an inequality that will have these set of points as its solution set could be
x^2 - 81 < 0
or |x| < 9