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
Here's 2)
$\displaystyle x^2+v=w$
I need to isolate the term with $\displaystyle x$ in it. I can do this by subtracting $\displaystyle v$ from both sides to give:
$\displaystyle x^2=w-v$
And now, I just need to take the square root to obtain:
$\displaystyle x=\sqrt{w-v}$
Note that it should ideally be $\displaystyle |x|$, 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.