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Answer :
Answer:
D
Step-by-step explanation:
given the sum
(7x³ - 4x² ) + (2x³ - 4x² )
distribute both parenthesis by 1
= 7x³ - 4x² + 2x³ - 4x² ← collect like terms
= (7x³ + 2x³ ) + (- 4x² - 4x² )
= 9x³ + (- 8x² )
= 9x³ - 8x²
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