I am struggling to solve this inequality.

I do know

From guessing and checking, I know

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- December 31st 2010, 06:23 PM #1

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- December 31st 2010, 06:44 PM #2
First draw a graph of - it has a turning point at (0, 2) and the shape

*appears*parabolic (it's not a parabola of course, it's a cosh function).

So your job is simply to solve :

Solve this quadratic for (reject one of the solutions for obvious reasons) and hence solve for y. Now use the graph you drew to solve the given inequality.

- December 31st 2010, 09:21 PM #3

- December 31st 2010, 09:59 PM #4

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- January 1st 2011, 01:17 AM #5

- January 1st 2011, 03:26 AM #6

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- January 1st 2011, 04:14 AM #7

- January 1st 2011, 08:32 AM #8