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What is the difference of the polynomials?

[tex](5x^3 + 4x^2) - (6x^2 - 2x - 9)[/tex]

A. [tex]-x^3 + 6x^2 + 9[/tex]

B. [tex]-x^3 + 2x^2 - 9[/tex]

C. [tex]5x^3 - 2x^2 - 2x - 9[/tex]

D. [tex]5x^3 - 2x^2 + 2x + 9[/tex]

Answer :

We start with the expression

$$
(5x^3 + 4x^2) - (6x^2 - 2x - 9).
$$

The first step is to distribute the negative sign over the second polynomial:

$$
5x^3 + 4x^2 - 6x^2 + 2x + 9.
$$

Next, combine like terms. Notice that the terms $4x^2$ and $-6x^2$ are like terms:

$$
5x^3 + (4x^2 - 6x^2) + 2x + 9 = 5x^3 - 2x^2 + 2x + 9.
$$

Thus, the difference of the polynomials is

$$
5x^3 - 2x^2 + 2x + 9.
$$

This corresponds to option 4.

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