##### Like what you saw?

##### Create FREE Account and:

- Watch all FREE content in 21 subjects(388 videos for 23 hours)
- FREE advice on how to get better grades at school from an expert
- Attend and watch FREE live webinar on useful topics

# Factoring the Sum or Difference of Cubes - Problem 1

###### Carl Horowitz

###### Carl Horowitz

**University of Michigan**

Runs his own tutoring company

Carl taught upper-level math in several schools and currently runs his own tutoring company. He bets that no one can beat his love for intensive outdoor activities!

Factoring trinomials. Now for this particular problem we are factoring xÂ³ minus 8 which is the difference of cubes? If you think about it 8 is actually just 2Â³. So we need to go to our formula.

We have a formula for difference of cubes, aÂ³ minus bÂ³ is a minus b, the first sign is the same. 8Â² plus ab, the second sign is the opposite and then plus bÂ², the last sign is always positive.

So from here we just want to plug in the corresponding a and b. So looking at this we have aÂ³, xÂ³, so a is just going to be x, a is 2Â³. So b is just going to be 2, and then plugging in the corresponding values. So this is just going to be equal replacing a with x and b with 2.

X minus 2, xÂ² plus 2x plus 2Â² or 4. Using our formula our difference of cubes to factor xÂ³ minus 8.

Please enter your name.

Are you sure you want to delete this comment?

###### Carl Horowitz

B.S. in Mathematics University of Michigan

He knows how to make difficult math concepts easy for everyone to understand. He speaks at a steady pace and his step-by-step explanations are easy to follow.

i love you you are the best, ive spent 3 hours trying to understand probability and this is making sense now finally”

BRIGHTSTORM IS A REVOLUTION !!!”

because of you i ve got a 100/100 in my test thanks”

##### Sample Problems (3)

Need help with a problem?

Watch expert teachers solve similar problems.

## Comments (0)

Please Sign in or Sign up to add your comment.

## ·

Delete