human
Solve quadratic equations using factorisation in the form x(x + b)  Tom and Katie are arguing about how to solve this equation: 

\(
x^{2}+4 x=0
\)

Tom says one solution is \( x=2 \)

Katie says one solution is \( x=0 \)

Who is correct? Both Tom and Katie
gpt
Thinks x^2 - a^2x is a valid form of difference of two squares