x^2+4x+3

This is an easy one...

x^2+4x+3

(x+3)(x+1)

The expression you provided, x^2 + 4x + 3, represents a quadratic polynomial. To find the value of this expression, you need to substitute a specific value for x.

Let's say you want to find the value when x equals 2. To do this, you substitute 2 for x in the expression:

(2)^2 + 4(2) + 3
= 4 + 8 + 3
= 15

Therefore, when x is equal to 2, the expression x^2 + 4x + 3 equals 15.

Keep in mind that the value of the expression can vary depending on the value you substitute for x. If you need to find the expression's value for different values of x, you can repeat this process by substituting the desired values into the expression.