i need to know how adding and subtracting rational expressions is similar to adding and subtracting simple fractions and how they are different

Question

isaiah.feynman · Answer

Ponder on this simple formula..$$\frac{ a }{ b }\pm \frac{ c }{ d }= \frac{ ad \pm bc }{ bd }$$
THIS FORMULA IS UNIVERSAL, IT APPLIES TO BOTH RATIONAL EXPRESSIONS AND SIMPLE NUMERICAL FRACTIONS.

anonymous · Answer

im not sure how to put that in words

anonymous · Answer

im not even sure what that is

isaiah.feynman · Answer

IT SHOWS HOW TO ADD OR SUBTRACT TWO FRACTIONS.

anonymous · Answer

so you add the two fractions and then you put them both together?

isaiah.feynman · Answer

A quick example with simple fractions..|dw:1388008371115:dw|