To add or subtract two rational expressions with the same denominator, we simply add or subtract the numerators and write the result to the common denominator.
The lowest common denominator is the lowest number of all common multiples of the denominators when 2 or more fractions are given. Let's add two fractions. Since adding them will be difficult because the denominators are not the same, so we need to find a common number to simplify it.
The easiest common denominator to use will be the lowest common denominator or LCD. The LCD is the lowest multiple that the denominators have in common. To find the LCD of two rational expressions, we factor the expressions and multiply all the distinct factors.
To make the denominators the same, we can: Multiply the top and bottom of each fraction by the denominator of the other. We've simplified the fraction 2032 to 1016 , then to 58 by dividing the top and bottom by 2 each time, and it's as simple as it gets!
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