Find the End Behavior x^8-3x^7-9x^5-5x^3

$x^{8} - 3 x^{7} - 9 x^{5} - 5 x^{3}$

Step 1

Write $x^{8} - 3 x^{7} - 9 x^{5} - 5 x^{3}$ as a function.

$f (x) = x^{8} - 3 x^{7} - 9 x^{5} - 5 x^{3}$

Step 2

Identify the degree of the function.

Identify the exponents on the variables in each term, and add them together to find the degree of each term.

$x^{8} \to 8$

$- 3 x^{7} \to 7$

$- 9 x^{5} \to 5$

$- 5 x^{3} \to 3$

The largest exponent is the degree of the polynomial.

$8$

Step 3

Since the degree is even, the ends of the function will point in the same direction.

Even

Step 4

Identify the leading coefficient.

The leading term in a polynomial is the term with the highest degree.

$x^{8}$

The leading coefficient in a polynomial is the coefficient of the leading term.

$1$

Step 5

Since the leading coefficient is positive, the graph rises to the right.

Positive

Step 6

Use the degree of the function, as well as the sign of the leading coefficient to determine the behavior.

1. Even and Positive: Rises to the left and rises to the right.

2. Even and Negative: Falls to the left and falls to the right.

3. Odd and Positive: Falls to the left and rises to the right.

4. Odd and Negative: Rises to the left and falls to the right

Step 7

Determine the behavior.

Rises to the left and rises to the right

Step 8