Expand and simplfy (2x+1) (x+3)

(2x+1) (x+3)

2x (x+3) + 1 (x+3)

2x2+6x+x+3

2x2+7x+3 (2x2 means two x square)

if you want you can also multiply 2x+3 by x+3

like this:

(2x+1) (x+3)

x (2x+1) + 3 (2x+1)

2x2+x+6x+3

2x2+7x+3 (2x2 means two x square)

They will both give you the same answer.