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March 28, 2015

March 28, 2015

Posted by **Allen** on Friday, October 13, 2006 at 1:33pm.

The short answer is that addition and multiplication are different operations with different properties.

If we added rational expressions directly without using the LCD the answer would be nonsense. Consider this

1/2 + 1/2 = (1+1)/(2+2) = 2/4 = 1/2 ??

Does that make any sense?

We know the right answer should be 1/2 + 1/2 = 1.

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