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1.6 Warm-Up Solution

Problem

Write the following inequalities in interval & set – builder notation.

a. 

b. 

c. 

Solution

Remember when using interval notation, we use brackets to include a number and parentheses to exclude a number.

a.  The solution is  [3, 6)
     since x can be equal to any number equal to or larger than 3 and any
     number less than, but not equal to 6.

b. The solution includes any number greater than, but not equal to 4,
    so our solution is: 

c. The solution includes any number less than, but not equal to 6,
    so our solution is: 

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