Show how to use the identity below to calculate the sum of the cubes of your numbers without using a calculator.

a3 +b3 =(a+b)(a2 −ab + b2)

CHOOSE ONE set, A, B, or C to use for the following:

A) a=9 and b=12

B) a=10 and b=14

C) a=11 and b=13

Rewritten as the sum of cubes:



Calculate the sum of the cubes without using a calculator:

To simplify the equation, Erika must isolate the x. This means to get the x by itself. In order to do so, Erika needs to divide 50x by fifty to undo the multiplication. What is done on on side, must be done on the other by the Division Property of Equality. Therefore, Erika must divide seventeen by fifty as well. The answer Erika should end up with is x=0.34