# Forming a formula from a-b=c-d

by khazaymeh
Tags: abcd, forming, formula
 P: 2 Hi, I am beginner in mathematics , I have the following relationship: a-b=c-d I need to calculate c under the assumption that a, b and d are known values. I got c=a-b+d and c=a/b*d can I use any other formulas?!!
PF Gold
P: 6,340
 Quote by khazaymeh Hi, I am beginner in mathematics , I have the following relationship: a-b=c-d I need to calculate c under the assumption that a, b and d are known values. I got c=a-b+d and c=a/b*d can I use any other formulas?!!
c=a-b+d follows directly from the stated relationship. Where did you get c=a/b*d ???
Mentor
P: 21,305
 Quote by khazaymeh Hi, I am beginner in mathematics , I have the following relationship: a-b=c-d I need to calculate c under the assumption that a, b and d are known values. I got c=a-b+d
What you got above is correct. To solve for c, add d to both sides of the equation.

I don't know how you got the equation below, but it's incorrect.
 Quote by khazaymeh and c=a/b*d can I use any other formulas?!!
The equation you started with is very simple, so the only possible differences are how the three terms on the other side are arranged, with a total of six ways.

c = a - b + d
c = a + d - b
c = d + a - b
c = d - b + a
c = -b + a + d
c = -b + d + a

P: 421
Forming a formula from a-b=c-d

 Quote by khazaymeh Hi, I am beginner in mathematics , I have the following relationship: a-b=c-d I need to calculate c under the assumption that a, b and d are known values. I got c=a-b+d and c=a/b*d can I use any other formulas?!!
c=a-b+d follows from a-b=c-d

c=a/b*d follows from a/b=c/d

Did you write it down in a way that your -'s look like /'s ?

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