Cant get to grips with re arranging formulae

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chaz699
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Homework Statement



basically i can't get to grips with rearranging formulae

the question is

make U the subject

fv = uv
u+v

(uv is divded by u+v)




2. The attempt at a solution

i try at making them into brackets etc but i can't get to it


can someone show me step by step how to do it


thanks, much appreciated
 
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Welcome to Physics Forums.

We won't show you how to do the question, but we will help you do it yourself.

When trying to make something the subject of a formula the best thing to do is to get it out of the fraction. How could you get (u+v) out of the fraction?
 
erm, put it on the other side of the formula?
 
erm multiply out the brackets?
 
so would it befu+fv+vu+v(squared)=uv
 
i don't quite understand that bit
 
er no hah

i don't see how my answer is wrong
 
would it be FVU+FV(squared) = UV
 
i actually have no idea
 
so then it would be

fv(squared) = uv-fvu?
 
erm

fv(squared) = u(v-fv)?
 
and then

fv(squared) = u
(v-fv)
 
chaz699, your notation is a little difficult to follow because, in case you do not yet have a way to use mathematical typesetting, you have also not yet learned how to express things in purely text symbolism. Other than that, you need to practice some number properties operations which lead up to your current exercise. (they are often called, "Field Axioms" or "Properties of Equality". ) Are you by some great chance studying Beginning Algebra or Introductory Algebra? Are you studying Pre-Algebra?
 
im studying a level physics (after high school, before university)

i just find rearranging formula hard
 
From chaz699,
I am studying a level physics (after high school, before university)

i just find rearranging formula hard

Not sure what that physics course means, but that placement suggests what many might consider to be "introductory physics", requiring basic algebra, ability to use simple Trigonometry, but no use of Calculus; a physics course which does not count toward an engineering or science undergraduate degree. Even so, such an introductory course requires, absolutely requires basic algebra skills, so if you are weak as you seem, you need to thoroughly restudy Introductory and most of Intermediate Algebra BEFORE you study your current apparent Introductory Physics course.

As for typesetting to make your math expressions clearer, one of the Reply To Thread features will give you a set of tools which will let you perform some mathematical typesetting. See the icons above the message field; they give you various symbol control effects. Not all the best typesetting features are available, but you may be able to use TEX or LaTEX, or something.
Superscript: X2
Subscript: X2
 

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