Respuesta :

ivystorm
First, we want to find the GCF of 15 and 21, which is 3. Now we do 15 divided by 3 and 21 divided by 3, which gives us 5 and 7. To rewrite the expression, we take the GCF and put it on the outside of the parenthesis. Inside the parenthesis, we put 5 + 7. So it'll look like this:

3(5 + 7)

Answer:

[tex]3(5+7)[/tex]

Step-by-step explanation:

We are asked to rewrite 15+21 using the GCF and the distributive property.

We know that greatest common factor of 15 and 21 is 3.

[tex]15=3\times 5[/tex] and [tex]21=3\times 7[/tex].

We can rewrite our given expression as:

[tex]3\times 5+3\times 7[/tex]

Now, we will factor out 3 from our expression as:

[tex]3(5+7)[/tex]

Therefore, after rewriting our given expression using the GCF and the distributive property we will get [tex]3(5+7)[/tex].