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-5/2x>30
Guest Jan 30, 2012
 #1
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what is the answer to -5/2x>30?
Guest Jan 30, 2012
 #2
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Quote:

what is the answer to -5/2x>30?



-5/2x > 30

-5/2x results in a problem at x=0:
so let's see the plot:
[input]plot( -5/(2x) , 30, x= -1..1, -10..40 )[/input]

as you can see, for all x>0 the result of -5/2x will be less than zero.

for x < 0:

-5/(2x)
x in the denominator, so try the reciprocal value: (switch > to <)

-5/2x > 30 | reciprocal
(2x)/-5 < 1/30
(2x) < -5/30 |*(-5)
x > -5/60 |/2
x > -1/12

so the result is: -1/12 < x < 0
admin  Jan 30, 2012

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