Posted by **Angel007** on Sunday, August 7, 2005 at 1:15pm.

Find the LCD for the given rational expressions, and convert each rational expression into an equivalent rational expression with the LCD as the denominator. 3 5

----, ----

84a 63b

4b 6

-----, ----

75a 105ab

Can someone here help me I do not understand this at all need help!

Your types question got the fractions all scrmbled. I will assume the fractions you are trying to find the LCD for are

3/(84 a), 5/(63 b), 4b/(75 a) , and 6/(105 ab)

To get the LCD, factor all the demominators into prime factors, plus the algebraic characters a and b.

84 a -> 2*2*2*3*7 a

63 b -> 3*3*7 b

75 a -> 3*5*5 a

105 ab -> 3*5*7 a b

The LCD must contain all the prime factors for as many times as they occur in the term that has the most of them. You end up with

LCD = 2*2*2*3*3*5*5*7 a b

= 12,600 a b

3/(84 a) = 450 b/12,600 ab

5/(63 b) = 1000 a/12,600 ab

4b/(75 a) = 672 b/12,600 ab

6/(105 ab) = 720/12,600 ab

## Answer This Question

## Related Questions

- algebra - Find the LCD for the given rational expressions, and convert each ...
- algebra - Reduce to lowest terms 3x-6/x^2-4x+4 perform operation w^2-1/(w-1)2 ...
- Help1 - WHY rational expressions that are being added must have an LCD, but ...
- Algebra - how do you do this - (-7yt)/(3x)=?/(18xyt) Building up the denominator...
- Algebra - Build each rational expression into an equivalent rational expression ...
- algebra - Build each rational expression into an equivalent rational expression ...
- Algebra - -7yt/3x=? /18xyt Build each rational expression into an equivalent ...
- Algebra - Rewrite the rational expression as an equivalent rational expression ...
- algebra - what are rational expressions? Why must we always be mindful of the ...
- math - find the lcd of this rational algebraic expression 4/x+2,2/2-x,3/4-x^2 ...

More Related Questions