So you will have to use the F.O.I.L process but also your question is(x+3)(2x-1)
then you break it down to simplest form which would be 2x^2- x+6x-3 then you will get your answer
your answer is: 2x^2+x-3
and remember to use the F.O.I.L which stands for First,Outside,Inside,Last so I really hopes this helps