Answer
$20x^2+19x+3$
Work Step by Step
I use the FOIL method:
$(4x+3)(5x+1)=20x^2+4x+15x+3=20x^2+19x+3$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.