(5x - 2 + 3x^{2}) + (4x + 3)

A: 3x^{2} + 9x + 1

B: 3x^{2} + x + 5

C; 3x^{2} + 9x - 1

D: 12x^{4} + 1

(5x - 2 + 3x2) + (4x + 3)

5x - 2 + 3x^2 + 4x + 3

3x^2 + 9x + 1 A is correct.

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