Solve 5/(2x+1)?? please show your work.

Question

anonymous · Answer

What are we solving for here?

anonymous · Answer

x i believe.

anonymous · Answer

What does it equal?

anonymous · Answer

my text says something about the domain of a variable. if that helps

anonymous · Answer

i got 10.

solve 2x-1 = 0
you get 1/2 or 0.5

5 divided by 0.5 would be 10.
not sure if correct, but it was a shot.

anonymous · Answer

could be -10 as well

5/2x - 1
multiply both numerator and denominator by 2 give:
10/-1 which equals -10....just throwing ideas, hopefully someone can check me on my math.

anonymous · Answer

nvm that would leave the denominator as x-1, i screwed that up....

anonymous · Answer

by book gave the answer 1/2

anonymous · Answer

Okay. The domain is the range of values for a variable where a function is defined. $$\text {Let}~~ f(x) = {5 \over (2x+1)}$$A rational function (rational means fraction) is undefined when the denominator is equal to zero. Therefore, $$2x+1 \ne 0$$The denominator is equal to zero only when x = -1/2. Therefore, the domain, in set notation, is $$(-\infty,-{1 \over 2}) \cup (-{1 \over 2}, + \infty)$$

anonymous · Answer

its 2.5

2x+1
dividing by 2 gives x=1/2 or 0.5

thus, 2(0.5) =1
1+1 =2
5/2 =2.5

im sure of this.

anonymous · Answer

its another way of saying 1/2 so hollywood_chrissy was right.

anonymous · Answer

you mean eastmore was right

anonymous · Answer

eashmore I believe its more of an algebraic problem than it is funstion and set notation, otherwise it would have been stated as such. @ Hollywood: sorry meant your book was right.