Math Is Fun Forum

catherine92

Member

Registered: 2009-12-10

Posts: 1

Rearranging Formulae

Hi

Im new to this forum, can someone help me to rearrange this formula as to make "d" the subject

Here is the formula      a=√d/be

Thanking anyone in advance

Catherine 92

careless25

Real Member

Registered: 2008-07-24

Posts: 560

Re: Rearranging Formulae

a = √d/be

is the square root sign just over d or is it over d/be?

if it just over d, here is the re arranged formula:

a*be = (√d)/(be) * be
abe = √d
(abe)^2  = (√d)^2
a^2*b^2*e^2 = d or d = (abe)^2

if the square root sign is over d/be, here is the rearranged formual:

a = √d/be
a^2 = (√d/be)^2
a^2 = d/be
a^2 * be = d/be * be
a^2 * be = d

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Rearranging Formulae

Hi catherine92;

Welcome to the forum!

Try to use parentheses to eliminate confusion. As careless25 points out it is tough to understand   a=√d/be. If you use a=√( d / be ) it looks a lot better and there is no confusion.

I know that it is becoming kind of popular on forums. to use a=√d/be to mean a=√( d / be ) or 1/x^2+3x+5 to mean 1 / ( x^2+3x+5 ), but that is just a poor method and delays getting your questions answered.

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In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.