# How to find x intercept of a rational function?

Many students want to know How to find x intercept of a rational function? A function that can be expressed as the ratio of two polynomials. For example, the function f(x)=2x/(x^2+1) can be expressed as a rational function.

## How to find x intercept of a rational function?

When determining the y-intercept of a rational function, we substitute x = 0 in the function and determine the corresponding value of y. When determining the x-intercept of a rational function, we do the same.

To find the x-intercept of a rational function, set y=0 and solve for x.

For example, consider the rational function f(x)=2x/(x^2+1).

To find the x-intercept, set y=0 and solve for x:

0=2x/(x^2+1)

0=2x/x^2+1

0=2/x+1

-1=2/x

x=-1/2

Therefore, the x-intercept of the rational function f(x)=2x/(x^2+1) is -1/2.

As another example, consider the rational function g(x)=4x^3/(x^4+1).

To find the x-intercept, set y=0 and solve for x:

0=4x^3/(x^4+1)

0=4x^3/x^4+1

0=4x^3-x^4

0=x(4x^2-x^3)

0=x(x-1)(4x+1)

Therefore, the x-intercepts of the rational function g(x)=4x^3/(x^4+1) are 0, 1, and -1/4.

Note that a rational function can have multiple x-intercepts, just as a linear function can have multiple x-intercepts.

## How do you find the x intercept of a rational equation?

To find the x intercept of a rational equation, set y equal to zero and solve for x.

For example, consider the equation y = (x-3)/(x+5). To find the x intercept, set y equal to zero and solve for x:

0 = (x-3)/(x+5)

0(x+5) = (x-3)

0x + 0 = x – 3

-3 = x – 3

-3 + 3 = x

0 = x

The x intercept of this equation is 0.

## How do you find the intercept of X and Y?

To find the intercept of X and Y, use the equation for a line in slope-intercept form, which is y = mx + b. In this equation, m is the slope and b is the y-intercept. To find the y-intercept, set x = 0 and solve for y. To find the x-intercept, set y = 0 and solve for x.

Example:

Find the intercepts of the line with the equation y = 2x + 3.

To find the y-intercept, set x = 0 and solve for y.

y = 2x + 3

Next y = 2(0) + 3

y = 3

To find the x-intercept, set y = 0 and solve for x.

y = 2x + 3

0 = 2x + 3

0 – 3 = 2x

-3 = 2x

x = -3/2

## How do you find the x intercept of a radical function?

To find the x intercept of a radical function, set y=0 and solve for x.

For example, consider the function y=√x. Setting y=0 and solving for x gives x=0.

### find the x-intercept of a cube root?

There is no x-intercept for a cube root. A cube root is always defined for any real number, even if it is negative.

## How do you find the vertical intercept of a rational function?

The vertical intercept of a rational function is the point where the function crosses the y-axis. To find the vertical intercept, set f(x)=0 and solve for x.

For example, consider the function

f(x)=2x+1

To find the vertical intercept, set f(x)=0 and solve for x.

0=2x+1

-1=2x

x=-1/2

Therefore, the vertical intercept is at (-1/2,0).

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