Thursday

September 18, 2014

September 18, 2014

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.

**Answer this Question**

**Related Questions**

Algebra - Find the LCD for the given rational expressions, and convert each ...

algebra - Find the LCD for the given rational expressions, and convert each ...

Algerbra 1 - 1/3x + 5/6 = 2/9x - 1/3 How do I solve this to get the answer? For ...

Math - When adding and subtracting rational expressions, why do you need a LCD?

alg - Find the LCD for the following rational expressions. (-3 / x^2 - 2x + 1) (...

alg - Find the LCD for the following rational expressions. -3 / x^2 - 2x + 1 2x...

algebra - find the lcd of the rational expressions 1/35r, (r+3)/10r^2

Algebra - *correction of previous post* Find the LCD of the rational expressions...

alg - find the LCD for the following rational expressions. -3 / (x^2 - 2x) + 1...

algebra - Reduce to lowest terms 3x-6/x^2-4x+4 perform operation w^2-1/(w-1)2 ...