# Changing the subject in an equation

• Sep 10th 2011, 11:46 AM
poochie03
Changing the subject in an equation
Hi,
I know how to change the subject of the formula in an equation like u=v+2t, but I get confused when the equation is for example p=5xyz+5ab^2 making x the subject.
This is the answer I got:

p - 5ab^2= 5xyz
p - 5ab^2/5yz= x

x = p - 5ab^2/5yz

Was wondering if i could get some advice on whether the answer is correct and my steps as to how I got it are correct because I have a feeling I have made a mistake.

Thank you (Nod)
• Sep 10th 2011, 11:50 AM
skeeter
Re: Changing the subject in an equation
Quote:

Originally Posted by poochie03
Hi,
I know how to change the subject of the formula in an equation like u=v+2t, but I get confused when the equation is for example p=5xyz+5ab^2 making x the subject.
This is the answer I got:

p - 5ab^2= 5xyz
p - 5ab^2/5yz= x

x = p - 5ab^2/5yz

Was wondering if i could get some advice on whether the answer is correct and my steps as to how I got it are correct because I have a feeling I have made a mistake.

parentheses around your numerator and denominator ...

x = (p - 5ab^2)/(5yz)

... now you're done.