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3) (5x² + 4)-(3x² + 7 - x³)

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3) (5x² + 4)-(3x² + 7 - x³)

(15x² + 12)-(3x² + 7 - x³)

15x² + 12- 3x² + 7 - x³


- (x ^ 3 - 12x ^ 2 - 19)


19 - (x - 12) * x ^ 2


(12 - x) * x ^ 2 + 19