Question

For what value of x is the rational expression below undefined 2x+4/x-7

Answer 1

A rational expression is undefined when the denominator equals zero, so we need to make the denominator equal to zero. Set it to zero and solve:
x - 7 = 0
Add seven to both sides:
x = 7

And there's your answer!

Hope I helped, and let me know if you have any questions :)

Answer 2

`x=7`

Explanation:

we have

`(2x+4)/(x-7)`

we know that

In the given expression the denominator can not be equal to zero

therefore

To find the value of x for which the expression is undefined. equate the denominator to zero

`x-7=0`

Solve for x

Adds
`7` both sides

`x-7+7=0+7`

`x=7`