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Multiply:

[tex]\left(x^4+1\right)\left(3x^2+9x+2\right)[/tex]

Choose the correct expression:

A. [tex]x^4 + 3x^2 + 9x + 3[/tex]

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

C. [tex]3x^7 + 9x^6 + 2x^5[/tex]

D. [tex]3x^8 + 9x^4 + 2x^4 + 3x^2 + 9x + 2[/tex]

Answer :

Let's solve the problem of multiplying the two polynomials: [tex]\((x^4 + 1)\)[/tex] and [tex]\((3x^2 + 9x + 2)\)[/tex].

We'll do this by distributing each term from the first polynomial to each term in the second polynomial, combining like terms along the way.

1. Expand [tex]\((x^4 + 1)\)[/tex]:

- Multiply [tex]\(x^4\)[/tex] with every term in the second polynomial [tex]\((3x^2 + 9x + 2)\)[/tex]:
[tex]\[
x^4 \cdot 3x^2 = 3x^6
\][/tex]
[tex]\[
x^4 \cdot 9x = 9x^5
\][/tex]
[tex]\[
x^4 \cdot 2 = 2x^4
\][/tex]

2. Expand [tex]\((1)\)[/tex]:

- Multiply [tex]\(1\)[/tex] with every term in the second polynomial [tex]\((3x^2 + 9x + 2)\)[/tex]:
[tex]\[
1 \cdot 3x^2 = 3x^2
\][/tex]
[tex]\[
1 \cdot 9x = 9x
\][/tex]
[tex]\[
1 \cdot 2 = 2
\][/tex]

3. Combine all the terms together:
[tex]\[
3x^6 + 9x^5 + 2x^4 + 3x^2 + 9x + 2
\][/tex]

There's nothing to combine further, as all terms are of different degrees. Therefore, the final result of multiplying [tex]\((x^4 + 1)\)[/tex] and [tex]\((3x^2 + 9x + 2)\)[/tex] is:

[tex]\[
3x^6 + 9x^5 + 2x^4 + 3x^2 + 9x + 2
\][/tex]

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