# What is the formula for the difference of cubes?

## What is the formula for the difference of cubes?

A difference of cubes is a binomial that is of the form (something)3 – (something else)3. To factor any difference of cubes, you use the formula a3 – b3 = (a – b)(a2 + ab + b2). When you recognize a sum of cubes a3 + b3, it factors as (a + b)(a2 – ab + b2). For example, to factor 8×3 + 27, you first look for the GCF.

## What is the difference of perfect cubes?

A binomial factor (a – b) made up of the two cube roots of the perfect cubes separated by a minus sign. If the cube isn’t there, and the number is smaller than the largest cube on the list, then the number isn’t a perfect cube.

What is sum of difference of two cubes?

Factoring Sum and Difference of Two Cubes – ChiliMath.

### What is the difference of two squares in math?

The difference of two squares is a theorem that tells us if a quadratic equation can be written as a product of two binomials, in which one shows the difference of the square roots and the other shows the sum of the square roots. One thing to note about this theorem is that it does not apply to the SUM of squares.

### How to factor the difference of two perfect cubes?

How to Factor the Difference of Two Perfect Cubes A binomial factor (a – b) made up of the two cube roots of the perfect cubes separated by a minus sign. A trinomial factor made up of the squares of the two cube roots added to the product of the cube roots in the middle.

Which is sum of cubes?

Sum or Difference of Cubes. A polynomial in the form a 3 + b 3 is called a sum of cubes. A polynomial in the form a 3 – b 3 is called a difference of cubes.

#### What is the sum of cubes rule?

The rule for factoring the sum of two perfect cubes is almost the same as the rule for factoring the difference between perfect cubes. You just have to change two little signs to make it work. The sum of two cubes equals the sum of its roots times the squares of its roots minus the product of the roots, which looks like.

#### Which expression is sum of cubes?

Sum of Cubes. A sum of cubes is an expression such as x 3 + a 3, where both members of the expression are perfect cubes. Suppose the expression is 8y 3 + 27. The monomial 8y 3 is a perfect cube of 2y, because (2y) 3 equals 8y 3.