Which of the following is not a rational expression?

5x

2x^2/11

5x/x+2

1/x^2+11x+30

Question

Which of the following is not a rational expression? 

5x

2x^2/11

5x/x+2

1/x^2+11x+30

anonymous · Answer

the third one

anonymous · Answer

why not the fourth one

anonymous · Answer

@answereverything $$\frac{5x}{x+2}$$is a rational expression.

anonymous · Answer

i think it's the fourth one? is that right?

anonymous · Answer

@eseidl  oh, I thought it is 5X/X +2, u feel me?

jiteshmeghwal9 · Answer

ya! i also think this

anonymous · Answer

if the 4th one is not a rational statement, then if you were to use the quadratic equation on the denominators polynomial, then you would get some complex roots.

anonymous · Answer

which one did you think @jiteshmeghwal9 ?

anonymous · Answer

5x/(x+2) could be considered something other than rational at x=-2 because it's not defined.  However i'm guessing that is not what is being asked here.

jiteshmeghwal9 · Answer

d

anonymous · Answer

i'm going with d

anonymous · Answer

d

anonymous · Answer

i wouldn't be so sure about that. http://tutorial.math.lamar.edu/Classes/Alg/RationalExpressions.aspx

lgbasallote · Answer

just so you know..it's not D

lgbasallote · Answer

rational expressions mean there is an x in the denominator

lgbasallote · Answer

now..which option doesnt have x in the denominator?

anonymous · Answer

b

lgbasallote · Answer

@simplybeyoutiful can you draw out option A and option B for me?

anonymous · Answer

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