# Rearranging Equations

• November 15th 2011, 11:45 AM
joe5436
Rearranging Equations
Anyone help me solve these so that x is the subject

x ² = 7y

x ² + v = w

x ² divided by 3 = w+y

Thanks

• November 15th 2011, 11:52 AM
Quacky
Re: Rearranging Equations
Here's 2)

$x^2+v=w$

I need to isolate the term with $x$ in it. I can do this by subtracting $v$ from both sides to give:

$x^2=w-v$

And now, I just need to take the square root to obtain:

$x=\sqrt{w-v}$

Note that it should ideally be $|x|$, but I think that's running before we can walk.

Try the others for yourself and show your working if you get confused: it's very similar to this example.