If x = 3, what is the value of x^2 + 2x?

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To find the value of the expression x^2 + 2x when x = 3, first substitute 3 for x in the expression.

Starting with the expression:

x^2 + 2x

Substituting 3 for x gives:

(3)^2 + 2(3)

Calculating (3)^2 results in 9. Next, calculating 2(3) gives 6. Now, combine these results:

9 + 6 = 15.

Therefore, the value of the expression when x = 3 is 15. This confirms that the correct answer is indeed 15.