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What is the sum of the polynomial

What is the sum of the polynomial-example-1

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Answer: D

Work:

(7x^3 - 4x^2) + (2x^3 -4x^2)

7x^3 + 2x^3 -4x^2 + (-4x^2) *add like terms*

9x^3 - 8x^2


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