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anonymous

  • one year ago

WILL GIVE MEDAL! Solve the inequality and express the answer in interval notation. x^2-2x-15<=0 @nincompoop @Luigi0210 @jagr2713 @zepdrix @jim_thompson5910

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  1. triciaal
    • one year ago
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    first find the boundary when = 0 then adjust for the inequality

  2. triciaal
    • one year ago
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    |dw:1440206878104:dw|

  3. triciaal
    • one year ago
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    can you complete the square or use factoring and solve for x?

  4. anonymous
    • one year ago
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    x=5 and x=-3

  5. triciaal
    • one year ago
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    and you know when x = 0 what is y?

  6. anonymous
    • one year ago
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    y=-15? I'm not sure

  7. triciaal
    • one year ago
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    can you sketch the parabola/ graph to see it better you can use a test point to adjust for the inequality

  8. anonymous
    • one year ago
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    |dw:1440203610827:dw|

  9. anonymous
    • one year ago
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    sorry it's messy

  10. triciaal
    • one year ago
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    that's ok

  11. triciaal
    • one year ago
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    now the "check points"

  12. anonymous
    • one year ago
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    What do you mean? what about them?

  13. triciaal
    • one year ago
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    review the original

  14. triciaal
    • one year ago
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    f(x) < and =

  15. anonymous
    • one year ago
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    do you mean x^2-2x-15 as the checkpoint?

  16. triciaal
    • one year ago
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    |dw:1440207787638:dw|

  17. triciaal
    • one year ago
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    original when is f(x) <0?

  18. anonymous
    • one year ago
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    Do you mean the original is -3? Sorry I have no idea what you mean

  19. triciaal
    • one year ago
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    test point when x =-4 y>0 when x = |dw:1440207973434:dw|

  20. triciaal
    • one year ago
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    |dw:1440208082687:dw|

  21. anonymous
    • one year ago
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    where did the x=6 come from?

  22. anonymous
    • one year ago
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    so the answer is [-3, 5]?

  23. triciaal
    • one year ago
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    isn't that set notation just those values?

  24. triciaal
    • one year ago
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    |dw:1440208311886:dw|

  25. triciaal
    • one year ago
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    hint interval covers a range

  26. anonymous
    • one year ago
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    I'm supposed to do interval notation, where the bracket stands for "greater/less than or equal to"

  27. anonymous
    • one year ago
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    and a parentheses stands for less than or greater than

  28. triciaal
    • one year ago
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    the -4 and 6 were "test points " to check the inequality

  29. triciaal
    • one year ago
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    any other questions?

  30. anonymous
    • one year ago
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    @triciaal How do you solve the inequality (x^2)(e^x) ln x > 0??

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