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Standard Form of One-Variable Polynomials

Consider the polynomial: [tex]\frac{x}{4} - 2x^5 + \frac{x^3}{2} + 1[/tex]

Which polynomial represents the standard form of the original polynomial?

A. [tex]\frac{x^3}{2} - 2x^5 + \frac{x}{4} + 1[/tex]

B. [tex]-2x^5 + \frac{x^3}{2} + \frac{x}{4} + 1[/tex]

C. [tex]-2x^5 + \frac{x}{4} + \frac{x^3}{2} + 1[/tex]

D. [tex]1 - 2x^5 + \frac{x^3}{2} + \frac{x}{4}[/tex]


Sagot :

To write a polynomial in standard form, the terms must be ordered in descending powers of the variable [tex]\( x \)[/tex]. Let's take the given polynomial:

[tex]\[ \frac{x}{4} - 2x^5 + \frac{x^3}{2} + 1 \][/tex]

First, identify and list the individual terms along with their degrees:
- [tex]\( -2x^5 \)[/tex] : degree 5
- [tex]\( \frac{x^3}{2} \)[/tex] : degree 3
- [tex]\( \frac{x}{4} \)[/tex] : degree 1
- [tex]\( 1 \)[/tex] : degree 0

The standard form polynomial should arrange these terms from highest to lowest degree:

1. Start with the term of the highest degree, which is [tex]\( -2x^5 \)[/tex].

2. Next, include the term with the next highest degree, which is [tex]\( \frac{x^3}{2} \)[/tex].

3. Then, include the term with the next lower degree, which is [tex]\( \frac{x}{4} \)[/tex].

4. Finally, include the constant term, which is [tex]\( 1 \)[/tex].

So, we should combine these terms as follows:

[tex]\[ -2x^5 + \frac{x^3}{2} + \frac{x}{4} + 1 \][/tex]

To convert this to a common denominator and combine into a single rational expression:

[tex]\[ \frac{x}{4} - 2x^5 + \frac{x^3}{2} + 1 = \frac{-8x^5 + 2x^3 + x + 4}{4} \][/tex]

Thus, the polynomial in standard form is:

[tex]\[ \boxed{\frac{-8x^5 + 2x^3 + x + 4}{4}} \][/tex]

Among the given options, the polynomial that matches this standard form is:

[tex]\[ -2 x^5 + \frac{x^3}{2} + \frac{x}{4} + 1 \][/tex]

So the correct answer is:

[tex]\[ -2 x^5 + \frac{x^3}{2} + \frac{x}{4} + 1 \][/tex]