x^2 - 2x - 8 >= 0, 3 - x > 0, x^2-8x+15 > 0, x+3 > 0.

Uh oh! Wolfram|Alpha doesn't run without JavaScript.

Please enable JavaScript. If you don't know how, you can find instructionshere.Once you've done that, refresh this page to start using Wolfram|Alpha.