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What is the sum, in standard form, of [tex]\((5x^3 - 7x^2 + x^4) + (12x^2 + 3x^3 - 2x^4)\)[/tex]?

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[tex]\(\square\)[/tex]


Sagot :

To find the sum of the polynomials [tex]\((5x^3 - 7x^2 + x^4) + (12x^2 + 3x^3 - 2x^4)\)[/tex], follow these steps:

1. Align the polynomials by their degrees and combine like terms:

[tex]\[ \begin{aligned} & (+x^4) + (-2x^4) \\ & (+5x^3) + (+3x^3) \\ & (-7x^2) + (+12x^2) \\ \end{aligned} \][/tex]

2. Add the coefficients of the like terms:

- Coefficient of [tex]\(x^4\)[/tex]: [tex]\(1 - 2 = -1\)[/tex]
- Coefficient of [tex]\(x^3\)[/tex]: [tex]\(5 + 3 = 8\)[/tex]
- Coefficient of [tex]\(x^2\)[/tex]: [tex]\(-7 + 12 = 5\)[/tex]

3. Write the resulting polynomial by combining these like terms:

[tex]\[ -x^4 + 8x^3 + 5x^2 \][/tex]

4. Express the polynomial in standard form:
- Standard form means writing the polynomial in descending order of the powers of [tex]\(x\)[/tex].
- We already have it in standard form: [tex]\(-x^4 + 8x^3 + 5x^2\)[/tex].

5. Factor out any common terms (optional, but sometimes required):
- We can factor out [tex]\(x^2\)[/tex]:

[tex]\[ -x^4 + 8x^3 + 5x^2 = x^2(-x^2 + 8x + 5) \][/tex]

Therefore, the final answer in standard form is:

[tex]\[ \boxed{x^2(-x^2 + 8x + 5)} \][/tex]
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