Find the sum. See Examples 3–4. 8x3 – 3x2 + 4x – 8 - - + -9x3 – 2x2 - 5x + 5

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ChapterP: Prerequisites: Fundamental Concepts Of Algebra
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Problem 1MCCP: In Exercises 1-25, simplify the given expression or perform the indicated operation (and simplify,...
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### Example Problem: Finding the Sum of Polynomials

To find the sum of two polynomials, you add the corresponding coefficients of each term. Let's use the following polynomials as an example:

**Given Polynomials:**

\[8x^3 - 3x^2 + 4x - 8\]

\[+ (-9x^3 - 2x^2 - 5x + 5)\]

Follow these steps to find their sum:

1. **Align Coefficients:**
   Place the polynomials so that like terms (terms with the same exponent) are aligned:

   \[
   \begin{array}{r}
   8x^3 - 3x^2 + 4x - 8 \\
   + (-9x^3 - 2x^2 - 5x + 5) \\
   \end{array}
   \]
   
2. **Add Like Terms:**
   Add the coefficients of the like terms.

   - For \(x^3\) terms: \(8x^3 + (-9x^3) = -1x^3\)
   - For \(x^2\) terms: \(-3x^2 + (-2x^2) = -5x^2\)
   - For \(x\) terms: \(4x + (-5x) = -1x\)
   - Constant terms: \(-8 + 5 = -3\)

   Now, combine the results:

   \[
   -1x^3 - 5x^2 - 1x - 3
   \]

3. **Write the Final Sum:**
   The sum of the polynomials is:

   \[
   -x^3 - 5x^2 - x - 3
   \]

Using these steps, you can find the sum of any two polynomials by aligning like terms and then adding their coefficients.

Approach problems like these systematically, and you'll find the addition of polynomials to be straightforward!
Transcribed Image Text:### Example Problem: Finding the Sum of Polynomials To find the sum of two polynomials, you add the corresponding coefficients of each term. Let's use the following polynomials as an example: **Given Polynomials:** \[8x^3 - 3x^2 + 4x - 8\] \[+ (-9x^3 - 2x^2 - 5x + 5)\] Follow these steps to find their sum: 1. **Align Coefficients:** Place the polynomials so that like terms (terms with the same exponent) are aligned: \[ \begin{array}{r} 8x^3 - 3x^2 + 4x - 8 \\ + (-9x^3 - 2x^2 - 5x + 5) \\ \end{array} \] 2. **Add Like Terms:** Add the coefficients of the like terms. - For \(x^3\) terms: \(8x^3 + (-9x^3) = -1x^3\) - For \(x^2\) terms: \(-3x^2 + (-2x^2) = -5x^2\) - For \(x\) terms: \(4x + (-5x) = -1x\) - Constant terms: \(-8 + 5 = -3\) Now, combine the results: \[ -1x^3 - 5x^2 - 1x - 3 \] 3. **Write the Final Sum:** The sum of the polynomials is: \[ -x^3 - 5x^2 - x - 3 \] Using these steps, you can find the sum of any two polynomials by aligning like terms and then adding their coefficients. Approach problems like these systematically, and you'll find the addition of polynomials to be straightforward!
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