Question

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


A. 2
B. -2
C. -7
D. 7

Answer 1

\[\Large f(x)=\frac{2x+4}{x-7}\]

Answer 2

So, we can't divide by zero, right?

Answer 3

i believe so

Answer 4

its undefined so that s what got to me

Answer 5

What value of \(\Large x\) would cause this problem?

Answer 6

so would i just plus it all in?

Answer 7

Well that's one way of solving the puzzle, you can do that

Answer 8

what values of x makes the fraction undefined?

Answer 9

but how would i know which one is undefined?

Answer 10

waitttt! look at the denominator first

Answer 11

and hi miku hahaha

Answer 12

focus on that denominator just that denominator

Answer 13

we have x -7 right ?

Answer 14

7?

Answer 15

-7
yea

Answer 16

wouldn't it have to be positive to be a undefined?

Answer 17

whoa... x - 7
what value of x makes it 0?

it's like
x-7 = 0 solve for x

Answer 18

yeah it has to be positive to be undefined

Answer 19

if you have a fraction like 1/0 that's undefined...we can't divide by 0

Answer 20

ok thanks :)

Answer 21

i got it well i understand it haha