human
Factorise a single bracket containing a non-linear expression by taking out a single algebraic common factor (e.g. a) Tom and Katie are arguing about factorising 

Tom says \( p^{2}+9 p \equiv(p+3)(p+3) \) 

Katie says \( p^{2}+9 p \equiv p(p+9) \) 

Who is correct? Only Tom
gpt
When factorising a quadratic without a non variable term, tries to double bracket factorise