Answer:
12x - 8x^2 - 8.
Explanation:
To find the sum of the two expressions, we add the corresponding coefficients of each term:
(x - 5x^2 - 12) + (4 + 11x - 3x^2)
= x + 11x - 5x^2 - 3x^2 - 12 + 4
= 12x - 8x^2 - 8
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