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2. 3x^2 + 6 - 2x + 5x - 4x^2 + 9
To simplify the expression, combine "like terms" by adding or subtracting their coefficients.
Group the like terms together:
= (3x^2 - 4x^2) + (5x - 2x) + (6 + 9)
Simplify each group:
= -x^2 + 3x + 15
Therefore, the simplified expression is -x^2 + 3x + 15.