for what value is this rational expression undefined?
x+2/2x-1

Question

for what value is this rational expression undefined? 
x+2/2x-1

anonymous · Answer

attachment

anonymous · Answer

please use brackets

anonymous · Answer

Hi @cyter - please don't provide 'just an answer' - we're here to explain/teach, thanks!

Oh, and welcome back @rememberwhen2012 - long time no see ;)

hoblos · Answer

a rational expression is undefined when the denominator =0
2x-1=0
 x=1/2

anonymous · Answer

is it (x+2)/(2x-1) or (x+2)/x   -1

anonymous · Answer

if the denominator is 0, it is undefined
x=1/2

anonymous · Answer

thankyou everyone!

anonymous · Answer

There is a difference between $$ \huge x+2/2x-1$$ and $$\huge \frac{x+2}{2x-1}$$

In the first case 2/2x would be undefined for x=0. 2*0=0; but 2/0 is undefined. It doesn't make sense so every fraction with zero in the denominator is undefined and invalid. 

in the second case
x=1/2 would lead to it being undefined.

anonymous · Answer

And then @cyter TOTALLY redeems himself (said in Dumb&Dumber voice)! Great work cyter, and thank you, really appreciate your work!

anonymous · Answer

@cshalvey Thank you for the great work you are doing. You are the people who make openstudy unique. Thanks.