What is the degree of each polynomial?

[tex]\[
\begin{array}{l}
1. \left(x^2 - y\right)^2 \\
2. 8x^4 - 5x^7 + 4x^5 \\
3. \frac{x^2 y^3}{3} + 2x^3 + 8x^3 \\
4. x^4 + 2x^3 - 6x^4 - 17 \\
5. -x^2 + 7x - 4x \\
6. x^7 + y^8 + x^7 - y^8
\end{array}
\][/tex]

Degree [tex]$\square$[/tex]

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Answer :

Let's find the degree of each given polynomial step by step.

1. [tex]\((x^2 - y)^2\)[/tex]

First, expand the polynomial:
[tex]\[ (x^2 - y)^2 = (x^2 - y)(x^2 - y) = x^4 - 2x^2y + y^2 \][/tex]
Here, the term with the highest degree is [tex]\(x^4\)[/tex], so the degree is 4.

Degree: 4

2. [tex]\(8x^4 - 5x^7 + 4x^5\)[/tex]

Look at the degrees of each term:
[tex]\[ 8x^4 \text{ has degree } 4\\ -5x^7 \text{ has degree } 7\\ 4x^5 \text{ has degree } 5 \][/tex]
The highest degree term is [tex]\(-5x^7\)[/tex], so the degree is 7.

Degree: 7

3. [tex]\(\frac{x^2 y^3}{3} + 2x^3 + 8x^3\)[/tex]

Simplify the polynomial by combining like terms:
[tex]\[ \frac{x^2 y^3}{3} + (2x^3 + 8x^3) = \frac{x^2 y^3}{3} + 10x^3 \][/tex]
Now, look at the degrees of each term:
[tex]\[ \frac{x^2 y^3}{3} \text{ has degree } 2+3 = 5\\ 10x^3 \text{ has degree } 3 \][/tex]
The highest degree term is [tex]\(\frac{x^2 y^3}{3}\)[/tex], so the degree is 5.

Degree: 5

4. [tex]\(x^4 + 2x^3 - 6x^4 - 17\)[/tex]

Simplify the polynomial by combining like terms:
[tex]\[ (x^4 - 6x^4) + 2x^3 - 17 = -5x^4 + 2x^3 - 17 \][/tex]
Now, look at the degrees of each term:
[tex]\[ -5x^4 \text{ has degree } 4\\ 2x^3 \text{ has degree } 3\\ -17 \text{ (constant term) has degree } 0 \][/tex]
The highest degree term is [tex]\(-5x^4\)[/tex], so the degree is 4.

Degree: 4

5. [tex]\(-x^2 + 7x - 4x\)[/tex]

Simplify the polynomial by combining like terms:
[tex]\[ -x^2 + (7x - 4x) = -x^2 + 3x \][/tex]
Now, look at the degrees of each term:
[tex]\[ -x^2 \text{ has degree } 2\\ 3x \text{ has degree } 1 \][/tex]
The highest degree term is [tex]\(-x^2\)[/tex], so the degree is 2.

Degree: 2

6. [tex]\(x^7 + y^8 + x^7 - y^8\)[/tex]

Simplify the polynomial by combining like terms:
[tex]\[ (x^7 + x^7) + (y^8 - y^8) = 2x^7 + 0 = 2x^7 \][/tex]
Now, look at the degrees of each term:
[tex]\[ 2x^7 \text{ has degree } 7 \][/tex]
The highest degree term is [tex]\(2x^7\)[/tex], so the degree is 7.

Degree: 7

In summary:
[tex]\[ \begin{array}{l} \text{Degree } 4 \\ \text{Degree } 7 \\ \text{Degree } 5 \\ \text{Degree } 4 \\ \text{Degree } 2 \\ \text{Degree } 7 \\ \end{array} \][/tex]