Answer
$x^2+4x+3$
Work Step by Step
Using the distributive property of polynomials, the expression becomes $$=x(x+3)+x+3$$ $$=x(x)+3x+x+3=x^2+4x+3$$
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.