Question

expansion of (x+3y)(x-y)

Answer 1

(x+3y)(x-y)=x^2-xy+3xy-3y^2...

Answer 2

$(x + 3y)(x - y) \\ {x}^{2 } - xy + 3xy - 3 {y}^{2} \\ {x}^{2} + 2xy - 3{y}^{2}$
I hope this helps