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March 30, 2015

March 30, 2015

Posted by **derandra** on Saturday, November 12, 2011 at 9:43pm.

50/(x+4)+1<4x

- precalculus -
**Reiny**, Sunday, November 13, 2011 at 12:24am50/(x+4) < 4x-1

50 < (x+4)(4x-1)

4x^2 + 15x - 4 > 50

4x^2 + 15x - 54 > 0

(x+6)(4x-9) > 0

critical values are x = -6 , x = 9/4

A quick test for values in each of the 3 domains shows

x < -6 OR x > 9/4

I will let you translate the above into the interval notation you use.

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