Question

changing the subject to x:
what's x^2 + v = w ????

Answer 1

$x^{2} - v = w$
$x^{2} - v + v = -v + w$
$x^{2} = -v + w$
$\sqrt{x^{2}} = \±\sqrt{-v + w}$
$x = \±\sqrt{-v + w}$