# little algebra problem

Discussion in 'Math' started by Chrill3, Mar 11, 2010.

1. ### Chrill3 Thread Starter New Member

Mar 8, 2010
9
0
I have struggled a while with this one. I dont understand how it comes like this, from the beginning I have R2/(R2+R1+(1/x)) → (x*R2)/(1+x(R2+R1))
if someone can show me how it can change i will be very glad.

Last edited: Mar 12, 2010
2. ### t_n_k AAC Fanatic!

Mar 6, 2009
5,448
784
It can't - plug in some real values for R1, R2 and x and you'll find the two forms are different.

e.g. let x=5, R1=2 & R2= 3

R2/(R1+R2+x)=3/10

but

x*R2/(1+x(R1+R2))=5*3/(1+25)=15/26

3. ### Chrill3 Thread Starter New Member

Mar 8, 2010
9
0
oh sorry it should be like this = R2/(R2+R1+(1/x)) → (x*R2)/(1+x(R2+R1))

4. ### jpanhalt AAC Fanatic!

Jan 18, 2008
5,699
912
Multiply the numerator and denominator by x, then rearrange the denominator.

John

5. ### Ammaar_Saleem New Member

Mar 26, 2010
2
0
R2/(r2+r1+(1/x))

just take the lcm of denominator which is x in this case
now

r2/(r2*x+r1*x+1)/x

r2*(x)/(1+x(r1+r2))

r2x/(1+x(r1+r2))

thats all