# The domain of the expression − x 4 + x 3 + 9 x . ### Precalculus: Mathematics for Calcu...

6th Edition
Stewart + 5 others
Publisher: Cengage Learning
ISBN: 9780840068071 ### Precalculus: Mathematics for Calcu...

6th Edition
Stewart + 5 others
Publisher: Cengage Learning
ISBN: 9780840068071

#### Solutions

Chapter 1.4, Problem 6E
To determine

## The domain of the expression −x4+x3+9x .

Expert Solution

The domain of the given expression is R

Where R is real number

### Explanation of Solution

Given information:

The given expression is provided below

x4+x3+9x

Formula used:

Choose any value of x

Calculation:

Consider the expression as,

x4+x3+9x=0

Now, take x common from both side of the expression

Then, the expression will become as provided below

x4+x3+9x=0x(x3+x2+9)=0x=0or(x3+x2+9)=0

For any value of x ,the equation will satisfies.

Therefore the x(,)

So the x belongs from whole real number.

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