Answer:
x² + 4x + 3
Step-by-step explanation:
x • x = x²
x • 3 = 3x
1 • x = 1x
1 • 3 = 3
: x² + 3x + 1x + 3 = x² + 4x + 3
notice that 4x suddenly appeared in the middle and replaced both 3x and 1x, as we have to find the like terms where the exponent may be different but the variables aren't which then leads us to 3x and 1x as the two of them has the same x variable. after finding both like terms it must be added which means 3x + 1x = 4x.
