Answer:
9x3 (B)
Step-by-step explanation:
i just took the unit test, it was correct
The sum of the polynomial function is 9x^3 - 8x^2
Polynomial functions area function with a leading degree of 3 and above. Given the sum;
(7x^3-4x^2)+(2x^3-4x^2)
Expand
(7x^3-4x^2)+(2x^3-4x^2)
= 7x^3-4x^2 + 2x^3-4x^2
Collect like terms
7x^3 + 2x^3 - 4x^2 -4x^2
9x^3 - 8x^2
Hence the sum of the polynomial function is 9x^3 - 8x^2
Learn more on polynomial here: https://brainly.com/question/2833285
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