Adding and Subtracting Rational Expressions
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Don’t you hate it when you have too many rational expressions—or too few? Thank goodness for addition and subtraction. We don’t know what we’d do without those two.
|Basic Operations||Addition and Subtraction|
Of course, we're going to have to simplify things...
We'll be representing the unsplicing with the following equation...
Five x over x plus three minus x minus three over x plus three.
Duck DNA is mathematically represented by x minus three over x plus three. [Duck and a platypus with a DNA helix spinning behind them]
Since they have a common denominator…
…we can just squish them together into five x minus x minus three in parentheses, all [Hands squish the equation together]
over x plus three.
Getting rid of the parentheses, this breaks down into five x minus x plus three all over [Parentheses looks upset]
x plus three.
So the answer is four x plus three over x plus three.
This happens to be the DNA code for that kid from the Sixth Sense. [Kid with a duck on his knee]
We always wondered what happened to him. [Duck lays an egg]