Answer:
4x^2 + 12x + 9
Explanation:
Actually, you are to find (2x + 3)^2, which is "the square of 2x + 3."
2x + 3 is a binomial. There is a formula for the square of a binomial:
(a + b)^2 = a^2 + 2ab + b^2
Following this pattern,
(2x + 3)^2 becomes:
[2x]^2 + 2[2x][3] + [3^2], or
4x^2 + 12x + 9