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Multiply the polynomials: [tex]\left(7x^2 + 5x + 7\right)(4x - 6)[/tex]

A. [tex]28x^3 - 22x^2 - 2x + 42[/tex]
B. [tex]28x^3 - 22x^2 - 58x - 42[/tex]
C. [tex]28x^3 - 22x^2 - 2x - 42[/tex]
D. [tex]28x^3 - 62x^2 - 2x - 42[/tex]

Answer :

To multiply the polynomials [tex]\((7x^2 + 5x + 7)\)[/tex] and [tex]\((4x - 6)\)[/tex], we need to use the distributive property, which involves multiplying each term in the first polynomial by each term in the second polynomial. Here are the steps:

1. Multiply the first term of [tex]\(7x^2 + 5x + 7\)[/tex] by each term in [tex]\(4x - 6\)[/tex]:
- [tex]\( 7x^2 \times 4x = 28x^3 \)[/tex]
- [tex]\( 7x^2 \times -6 = -42x^2 \)[/tex]

2. Multiply the second term of [tex]\(7x^2 + 5x + 7\)[/tex] by each term in [tex]\(4x - 6\)[/tex]:
- [tex]\( 5x \times 4x = 20x^2 \)[/tex]
- [tex]\( 5x \times -6 = -30x \)[/tex]

3. Multiply the third term of [tex]\(7x^2 + 5x + 7\)[/tex] by each term in [tex]\(4x - 6\)[/tex]:
- [tex]\( 7 \times 4x = 28x \)[/tex]
- [tex]\( 7 \times -6 = -42 \)[/tex]

4. Combine all these results:
- Collect all the terms: [tex]\(28x^3, -42x^2, 20x^2, -30x, 28x, -42\)[/tex].

5. Combine like terms:
- Combine the [tex]\(x^2\)[/tex] terms: [tex]\(-42x^2 + 20x^2 = -22x^2\)[/tex]
- Combine the [tex]\(x\)[/tex] terms: [tex]\(-30x + 28x = -2x\)[/tex]

6. Write the final expression:
- The multiplied polynomial is [tex]\[ 28x^3 - 22x^2 - 2x - 42 \][/tex]

Therefore, the correct answer is C. [tex]\(28x^3 - 22x^2 - 2x - 42\)[/tex].

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