Answer:
x^2 + 6x + 9
Step-by-step explanation:
since the expression is squared, you are basically just multiplying the equation by itself, yielding (x+3) times (x+3). From that expression, you would FOIL, multiplying x by x, x by 3, 3 by x, and 3 by 3 and finding the sum of all of that. X multiplying by itself is x squared, and you would end up with two 3x's, giving you 6x, and lastly 3 times 3 is 9.
