Which expression is a factor of 10x2 + 11x + 3? x - 3 2x + 1 5x - 3 10x + 3

The two factors of 10x^2 + 11x + 3 are (2x + 1) and (5x + 3).

Let's check these two factors.

(2x + 1) (5x + 3) = 10x^2 + 5x + 6x + 3 = 10x^2 + 11x + 3

These two factors are indeed the two factors of 10x^2 + 11x + 3.

The correct answer is: 2x + 1