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

Answer:

$x=7$

Step-by-step explanation:

we have

$\frac{2x+4}{x-7}$

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

$x-7+7=0+7$

$x=7$