Decreasing and increasing intervals are written in reference to the x-values. ... Notice above there is a mixture of brackets and parenthesis in the set of increasing intervals. The use of brackets and parentheses are necessary in order to specify which values are included or not included in the interval.

Do brackets mean multiply?

The first way tells us to multiply. When we see two or more numbers together that are separated by parentheses, then the parentheses are telling us to multiply. For example, when we see 5(2), the parentheses are telling us to multiply the 5 and the 2 together. ... It still means multiplication.

What do brackets mean in math intervals?

The third method is interval notation, where solution sets are indicated with parentheses or brackets. ... The main concept to remember is that parentheses represent solutions greater or less than the number, and brackets represent solutions that are greater than or equal to or less than or equal to the number.