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Answer:

4x²+12x+9

Step-by-step explanation:

1.   2x times 2x = 4x²

2.  2x times 3 = 12x

3.  3 x 3 = 9   or  3² also equals 9
Answer: 4x^2-12x+9

Explanation: Use (a-b)^2=a^2-2ab+b^2 to expand the expression.

(2x^2)-2*2x*3+3^2

4x^2-2*2x*3+3^2

4x^2-12x+3^2

4x^2-12x+9