IXL - Unions and intersections of sets (Algebra 1 practice)

Let

{

–

}

and

{

}

What is

∪

{

–

}

{

–

}

{

}

∅

ref_doc_title.

Learn with an example

question

Let

{

–

}

and

{

–

}

What is

∩

{

–

}

{

–

}

{

–

}

{

–

}

key idea

The union of sets

and

is written

∪

It is the set whose elements are in set

set

or both.

The intersection of sets

and

is written

∩

It is the set whose elements are in both set

and set

solution

To find the intersection of set

and set

∩

look for numbers that are in both sets.

{

–

}

{

–

}

The numbers

–

and 1 are in both sets, so they are in the intersection of

and

∩

{

–

}

Looking for more? Try these:

Lesson: Compound inequalities

$Confetti$

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Teacher tools

Work it out

Not feeling ready yet? These can help:

G.1Sets, subsets, and complements

G.2Set-builder notation

Lesson: Compound inequalities

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