Polynomials are my favorite, so I am thrilled to help.
Product means multiply, so it basically wants you to multiply (4x+1) and (2x+3).
Here, let me walk you through it...
Step 1.) Write out the problem: (4x+1)(2x+3)
Step 2.) FOIL it: (4x)(2x) + (4x)(3) + (1)(2x) + (1)(3)
Step 3.) Solve it: 8x^2 + 12x + 2x + 3
Step 4.) Combind like terms: 8x^2 + 14x + 3
So the answer is...
8x^2 + 14x + 3
HOPE THIS HELPED!