Answer:
9x^4 + 6x^3 + 3x^2
Explanation:
3x^2 (2x^2 + 2x + 1)
= (2x^2(3x^2) + 2x(3x^2) + 1(3x^2) )
= 9x^4 + 6x^3 + 3x^2
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