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Answer:
3x^3 - x^2 +1
Explanation:
x^3 + 2x^3 = 3x^3
3x^2 + (-4x^2) = -1x^2
3 + (-2) = 1
3x³ - x² + 1
(3 + x³ + 3x²) + (2x³ - 2 - 4x²) ← remove parenthesis
= 3 + x³ + 3x² + 2x³ - 2 - 4x² ← collect like terms
= (x³ + 2x³) + (3x² - 4x²) + (3 - 2)
= 3x³ + (- x²) + 1
= 3x³ - x² + 1 ← in standard form
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