


Description 



Equivalent Expressions: Expressions that simplify to an equal value when numbers are substituted for the variables of the expression. 
For example, (a+b)^{2} and a^{2} + 2ab + b^{2} are equivalent since whatever the numbers you substitute for a and b, you can always get the same value for both expressions. For example take a = 1 and b = 2, then (1 + 2)^{2} = 9 = 1^{2} + 2*1*2 + 2^{2}.


