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What is the sum of the polynomials?

[tex]\left(7x^3 - 4x^2\right) + \left(2x^3 - 4x^2\right)[/tex]

A. [tex]5x^3[/tex]

B. [tex]9x^3[/tex]

C. [tex]5x^3 - 8x^2[/tex]

D. [tex]9x^3 - 8x^2[/tex]

Answer :

We are given the polynomials:

[tex]$$
P(x) = 7x^3 - 4x^2 \quad \text{and} \quad Q(x) = 2x^3 - 4x^2.
$$[/tex]

To find their sum, we add the corresponding terms.

1. For the [tex]$x^3$[/tex] terms:
[tex]$$
7x^3 + 2x^3 = 9x^3.
$$[/tex]

2. For the [tex]$x^2$[/tex] terms:
[tex]$$
-4x^2 + (-4x^2) = -8x^2.
$$[/tex]

Thus, the sum of the polynomials is:

[tex]$$
9x^3 - 8x^2.
$$[/tex]

Therefore, the answer is:

[tex]$$
\boxed{9x^3 - 8x^2}.
$$[/tex]

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