4x²+12x+9 is the answer
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The Brainliest Answer!
We can simply use the FOIL method (First, Outside, Inside, Last)

Click the attachment/picture below.

Therefore, we'll have 4x² + 12x + 9 as the final answer.

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Note: FOIL method can only be used in multiplying binomial to a binomial :)
also, about the pic, the O (the black one) should be L :) sorry