anonymous
  • anonymous
WILL GIVE MEDAL! Solve the inequality and express the answer in interval notation. x^2-2x-15<=0 @nincompoop @Luigi0210 @jagr2713 @zepdrix @jim_thompson5910
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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triciaal
  • triciaal
first find the boundary when = 0 then adjust for the inequality
triciaal
  • triciaal
|dw:1440206878104:dw|
triciaal
  • triciaal
can you complete the square or use factoring and solve for x?

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More answers

anonymous
  • anonymous
x=5 and x=-3
triciaal
  • triciaal
and you know when x = 0 what is y?
anonymous
  • anonymous
y=-15? I'm not sure
triciaal
  • triciaal
can you sketch the parabola/ graph to see it better you can use a test point to adjust for the inequality
anonymous
  • anonymous
|dw:1440203610827:dw|
anonymous
  • anonymous
sorry it's messy
triciaal
  • triciaal
that's ok
triciaal
  • triciaal
now the "check points"
anonymous
  • anonymous
What do you mean? what about them?
triciaal
  • triciaal
review the original
triciaal
  • triciaal
f(x) < and =
anonymous
  • anonymous
do you mean x^2-2x-15 as the checkpoint?
triciaal
  • triciaal
|dw:1440207787638:dw|
triciaal
  • triciaal
original when is f(x) <0?
anonymous
  • anonymous
Do you mean the original is -3? Sorry I have no idea what you mean
triciaal
  • triciaal
test point when x =-4 y>0 when x = |dw:1440207973434:dw|
triciaal
  • triciaal
|dw:1440208082687:dw|
anonymous
  • anonymous
where did the x=6 come from?
anonymous
  • anonymous
so the answer is [-3, 5]?
triciaal
  • triciaal
isn't that set notation just those values?
triciaal
  • triciaal
|dw:1440208311886:dw|
triciaal
  • triciaal
hint interval covers a range
anonymous
  • anonymous
I'm supposed to do interval notation, where the bracket stands for "greater/less than or equal to"
anonymous
  • anonymous
and a parentheses stands for less than or greater than
triciaal
  • triciaal
the -4 and 6 were "test points " to check the inequality
triciaal
  • triciaal
any other questions?
anonymous
  • anonymous
@triciaal How do you solve the inequality (x^2)(e^x) ln x > 0??

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