High School

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Divide the polynomial [tex]12x^7 + 48x^6 - 54x^4 - 6x[/tex] by [tex]2x[/tex]. Which of the following is the new polynomial?

A. [tex]2x^7 + 48x^6 - 54x^4 - x[/tex]
B. [tex]2x^7 + 8x^6 - 9x^4 - x[/tex]
C. [tex]12x + 48 - 54x^{-1} - 6x^{-5}[/tex]
D. [tex]10x^{13} - 9x^5[/tex]

Determine which of the following is a factor of [tex]f(x) = 2x^3 - 5x^2 - 68x + 35[/tex]. Suggestion: You can determine the factors from the roots visible on the graph.

A. [tex](x+5)[/tex]
B. [tex](x+7)[/tex]
C. [tex](2x+1)[/tex]
D. [tex](x-3)[/tex]

Answer :

To divide the polynomial [tex]\(12x^7 + 48x^6 - 54x^4 - 6x\)[/tex] by 2, you simply divide each coefficient in the polynomial by 2. Let's go through it step by step:

1. The original polynomial is [tex]\(12x^7 + 48x^6 - 54x^4 - 6x\)[/tex].

2. Identify the coefficients of each term:
- The coefficient of [tex]\(x^7\)[/tex] is 12.
- The coefficient of [tex]\(x^6\)[/tex] is 48.
- The coefficient of [tex]\(x^4\)[/tex] is -54.
- The coefficient of [tex]\(x\)[/tex] is -6.
- The polynomial does not include terms for [tex]\(x^5\)[/tex], [tex]\(x^3\)[/tex], or a constant term, so their coefficients are 0.

3. Divide each coefficient by 2:
- For [tex]\(x^7\)[/tex]: [tex]\( \frac{12}{2} = 6\)[/tex]
- For [tex]\(x^6\)[/tex]: [tex]\( \frac{48}{2} = 24\)[/tex]
- For [tex]\(x^5\)[/tex]: [tex]\( \frac{0}{2} = 0\)[/tex]
- For [tex]\(x^4\)[/tex]: [tex]\( \frac{-54}{2} = -27\)[/tex]
- For [tex]\(x^3\)[/tex]: [tex]\( \frac{0}{2} = 0\)[/tex]
- For [tex]\(x^2\)[/tex]: [tex]\( \frac{0}{2} = 0\)[/tex]
- For [tex]\(x\)[/tex]: [tex]\( \frac{-6}{2} = -3\)[/tex]
- For the constant term (no x): [tex]\( \frac{0}{2} = 0\)[/tex]

4. Write the resulting polynomial with the new coefficients:
- The result is [tex]\(6x^7 + 24x^6 - 27x^4 - 3x\)[/tex].

So, the polynomial [tex]\(12x^7 + 48x^6 - 54x^4 - 6x\)[/tex] divided by 2 is [tex]\(6x^7 + 24x^6 - 27x^4 - 3x\)[/tex].

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