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Write this polynomial in standard form.

A. [tex]6x^3 - 8x^4 + 5x + 12x^2 - 9[/tex]

B. [tex]12x^2 + 5x + 6x^3 - 9 - 8x^4[/tex]

C. [tex]-8x^4 - 6x^3 + 12x^2 + 5x - 9[/tex]

D. [tex]-8x^4 + 6x^3 + 12x^2 + 5x - 9[/tex]

Answer :

To write the polynomial in standard form, we need to arrange its terms in descending order by the exponent of [tex]\( x \)[/tex]. Follow these steps:

1. Start with the original polynomial:
[tex]$$
6x^3 - 8x^4 + 5x + 12x^2 - 9.
$$[/tex]

2. Identify each term with its corresponding exponent:
- The term with [tex]\( x^4 \)[/tex] is [tex]\( -8x^4 \)[/tex].
- The term with [tex]\( x^3 \)[/tex] is [tex]\( 6x^3 \)[/tex].
- The term with [tex]\( x^2 \)[/tex] is [tex]\( 12x^2 \)[/tex].
- The term with [tex]\( x^1 \)[/tex] is [tex]\( 5x \)[/tex].
- The constant term (with [tex]\( x^0 \)[/tex]) is [tex]\( -9 \)[/tex].

3. Arrange these terms in descending order of exponent (from highest to lowest):
[tex]$$
-8x^4 + 6x^3 + 12x^2 + 5x - 9.
$$[/tex]

Thus, the polynomial in standard form is:
[tex]$$
-8x^4 + 6x^3 + 12x^2 + 5x - 9.
$$[/tex]

This corresponds to option 4.

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