Question

how do you solve: 3 = √u-3 - √u

Answer 1

I'm a little confused with the notation, from how I read it, square both sides and get 9 = u - 3 - u.. which would come out as 9=3.. which is false..

Answer 2

well the square root sign goes over the whole u-3 if that makes sense

Answer 3

it's loos like complex answer...?

Answer 4

\[(3+\sqrt{u})=\sqrt{u-3}\]
\[9+6\sqrt{u}+u=u-3\]
\[6\sqrt{u}=-12\]
\[\sqrt{u}=-1/2\]