(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

In 6th edition of Engineering Mathematics, Programme F2 Intro to Algebra, so far I get it all there, but I'm stumped on one question in the revision excercise, it goes like this:

((2a-3)/4b)+((3a+2)/6b)

2. Relevant equations

He then goes on to break down the answers in the back:

A) 2a/4b - 3/4b + 3a/6b +2/6b

then

B) a/2b - 3/4b + a/2b + 1/3b

then

C) a/b - 5/12b

and finally the answer is

D) 1/12b*(12a-5)

3. The attempt at a solution

I can see how the question is re-written the first time round, and then I get the second part where the first division block is divided by 2, the third by 3 and the 4th by 2. The second one can't be made smaller obviously.

But how he gets (a/b)-(5/12b) and then 1/12b*(12a-5) is above me at the moment, I know it's something really basic that i've missed. Can anyone clarify for me please?

Thanks

Deian

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: K.A.Stroud Maths revision question

**Physics Forums | Science Articles, Homework Help, Discussion**