SOLUTION: Solve. (x+15)(x-10)(x+5)>0 Thank you very much!!!

Algebra ->  Algebra  -> Inequalities -> SOLUTION: Solve. (x+15)(x-10)(x+5)>0 Thank you very much!!!      Log On

 Ad: Algebrator™ solves your algebra problems and provides step-by-step explanations! Ad: Algebra Solved!™: algebra software solves algebra homework problems with step-by-step help!

 Algebra: Inequalities, trichotomy Solvers Lessons Answers archive Quiz In Depth

 Click here to see ALL problems on Inequalities Question 322443: Solve. (x+15)(x-10)(x+5)>0 Thank you very much!!!Answer by vleith(2825)   (Show Source): You can put this solution on YOUR website!Try to plot it. You know you have zeroes at x = 1-5, x = -5 and x=10 Pick a number greater than 10 (let's say 20). Plug that in and see that as x gets larger than 10, the solution gets more postive. So the curve rises to the right. Pick a number between -5 and 10 (pick 0 for instance). Solve that and see that that answer is less than 0. So the curve is below the x axis between -5 and 10. Pick a number between -15 and -5 (lit's use -10). Solve that and see the curve is above the x axis between -15 and -5. Pick a larger negative number (lets say -20) and see the answer lies below the x axis. Also, as x gets more negative, the reuslting point lies farther below the x axis. So the curve talis off to negative infinity . Now color in the places where the curve is above the x axis. That is -1510 Here is a plot for you http://www.wolframalpha.com/input/?i=%28x%2B15%29%28x-10%29%28x%2B5%29%3E0+