SOLUTION: I cant understand this formula for the sum of differences. my example is 8y^3-1

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Question 710732: I cant understand this formula for the sum of differences. my example is 8y^3-1
Found 2 solutions by fcabanski, lwsshak3:
Answer by fcabanski(1391)   (Show Source): You can put this solution on YOUR website!
There's not much to understand. The formula is like a recipe...plug in the numbers and variables.



Recognize that the initial expression is the difference of two cubes. so a=2y. so b=1.


The factored form is

Hope the solution helped. Sometimes you need more than a solution. Contact fcabanski@hotmail.com for online, private tutoring, or personalized problem solving (quick for groups of problems.)
Answer by lwsshak3(11628)   (Show Source): You can put this solution on YOUR website!
I cant understand this formula for the sum of differences. my example is 8y^3-1
**
Formula for the difference of two cubes:
For your example, it becomes clearer when you write the expression as a difference of two cubes.

remember:

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