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2 votes
Which inequality is equivalent to 
3+ (4)/(x) \geq (x+2)/(x) ?


(2x+2)/(x) \geq 0

(2x+6)/(x) \geq 0
C
(-x+5)/(x) \geq 0
D
(-x+9)/(x) \geq 0

Please show work and explain. I legitimately want to understand how to solve a question like this. Thank you!

1 Answer

2 votes
First, take all expressions to one side of the inequality:


\displaystyle{ 3+(4)/(x)- (x+2)/(x) \geq 0.

Multiply 3 by
\displaystyle{ (x)/(x) to write it as a fraction with denominator equal to the other expressions


\displaystyle{ (3x)/(x)+(4)/(x)- (x+2)/(x) \geq 0.


Since all three expressions have equal denominator, we collect them into one rational expression as follows:


\displaystyle{ (3x+4-x-2)/(x), which is equal to
\displaystyle{ (2x+2)/(x).


Thus the inequality is
\displaystyle{ (2x+2)/(x) \geq 0.


Answer: A
User Adir Kandel
by
9.0k points
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