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April 20, 2014

April 20, 2014

Posted by **Amy** on Tuesday, December 20, 2011 at 8:04pm.

x^2 - 22/ x -4 >_ -7/2

this sign > has the slash underneath

Help me!

- pre calculus -
**Damon**, Tuesday, December 20, 2011 at 8:21pmsuspect you mean

(x^2 -22)/(x-4) >/= -7/2

2x^2 - 44 >/= -7 x + 28

2 x^2 + 7 x - 72 >/= 0

for very large positive x this is true

for very large negative x this is true

where is it not true?

(it is a parabola)

when is that zero?

x = [ -7 +/- sqrt (625)]/4

= [-7 +/-25]/4

x = -8 or x = 4.5

so

x</=-8 or x>/=4.5

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