human
Rearrange formulae to change the subject where the subject appears once and three or more steps are needed Tom and Katie are discussing rearranging \( t=\sqrt{u+9} \) to make \( u \) the subject
Tom says a correct first line of working could be: \( t=\sqrt{u}+3 \)
Katie says a correct first line of working could be: \( t^{2}=u+9 \)
Who is correct? Only Tom
gpt
Thinks that the square root of an expression square roots each term in the expression, rather than square rooting the whole expression