Math CentralQuandaries & Queries


Question from Beth, a parent:

Do you do y=2+f(x) the same way as if the 2 came after the equation such as y=f(x) +2 when graphing?

Hi Beth,

Yes, 2 + f(x) = f(x) + 2. This is a fact concerning operations with real numbers. For any numbers a and b it is true that a + b = b + a. This is called the commutative law of addition.

You do however have to be careful with the parentheses. f(x) + 2 and f(x + 2) are not the same expression.


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