- #1

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A = B x (C / D) x (E x F)

To make D the subject would it be:

(C / D) = B x (E x F) / A

D = (B x (E x F) / A) x C

?

Thanks.

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- Thread starter questions_uk
- Start date

- #1

- 74

- 0

A = B x (C / D) x (E x F)

To make D the subject would it be:

(C / D) = B x (E x F) / A

D = (B x (E x F) / A) x C

?

Thanks.

- #2

- 4

- 0

A simpler method would be to apply the associative property of multiplication and just lump B, C, E, and F together so that you end up with (B x C x E x F)/D and isolate D from there.

- #3

- 74

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So assuming the commutative properties: D = B x C x E x F / A?

- #4

HallsofIvy

Science Advisor

Homework Helper

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No. To isolate C/D, because in your equation it is multiplied by B and (E x F) you mustHi. With the equation:

A = B x (C / D) x (E x F)

To make D the subject would it be:

(C / D) = B x (E x F) / A

[D = (B x (E x F) / A) x C

?

Thanks.

- #5

- 74

- 0

No. To isolate C/D, because in your equation it is multiplied by B and (E x F) you mustdivideboth sides by B x (E x F): C/D= A/(B x (E x F)). Then, to get the D into the numerator, "invert" both sides: D/C= (B x E x F)/A.

So assuming D/C = (B x E x F) / A would it not be D = (B x E x F) / A x C ?

Thanks.

- #6

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you multiply both sides by C in order to get rid of the C on the left hand side which makes the right hand side.

((B x E x F) / A ) x C which as you rightly said before is equal to

(B x E x F x C) / A

- #7

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Thanks!

- #8

HallsofIvy

Science Advisor

Homework Helper

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No, it wouldSo assuming D/C = (B x E x F) / A would it not be D = (B x E x F) / A x C ?

Thanks.

- #9

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Let's suppose you have the following formula:

A + D = 2*E + G

and I want G to be the subject of the formula. Is it OK if I write the answer like:

A + D - 2*E = G ?

Some mathematicians say it is OK to provide the answer in that fashion, but I was taught in high school you should always write the subject on the left side, like this:

G = A + D - 2*E

Am I wrong?

- #10

cepheid

Staff Emeritus

Science Advisor

Gold Member

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I have a question on this one: would it be OK when you are changing the subject of a formula to have the subject on the right side of the formula?

It makes no difference.

- #11

djeitnstine

Gold Member

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A + D - 2*E = G ?

Some mathematicians say it is OK to provide the answer in that fashion, but I was taught in high school you should always write the subject on the left side, like this:

G = A + D - 2*E

Am I wrong?

Its just the same way to express the same thing, neither is right nor wrong. You haven't violated any rules of math.

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