What is the answer to x squared plus x squared y plus 4x squared plus 3x?

To simplify the expression (x^2 + x^2y + 4x^2 + 3x), first combine the like terms involving (x^2). This results in ((1 + 1y + 4)x^2 + 3x = (5 + y)x^2 + 3x). The final simplified expression is ((5 + y)x^2 + 3x).