anonymous
  • anonymous
(x+16)(x-12)(x+2)>0
Mathematics
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
2x(8-6+1)>0
anonymous
  • anonymous
(x>0)2(8-6+1)
Mertsj
  • Mertsj
Make a sign graph of the factors. Do you need me to demonstrate?

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anonymous
  • anonymous
I believe the answer would be all real numbers because if any negative numbers are used they would be less than 0, not greater than.
Mertsj
  • Mertsj
|dw:1327194029245:dw|
Mertsj
  • Mertsj
The chart shows that the factor x+16 is negative to the left of -16 and positive to the right.
Mertsj
  • Mertsj
Do you understand that?
anonymous
  • anonymous
|dw:1327194152861:dw|
Mertsj
  • Mertsj
Ok, Walee, balaa wants to take over now. I'll let him explain it to you.
anonymous
  • anonymous
|dw:1327194276321:dw|
anonymous
  • anonymous
Ok so I don't have to multiply them at all?
anonymous
  • anonymous
Yes
anonymous
  • anonymous
Have you got it ?
anonymous
  • anonymous
No, I do understand what is being said but I don't understand how.
Mertsj
  • Mertsj
Do you want me to explain it ?
anonymous
  • anonymous
Yes, please. I don't multiply those three together?
Mertsj
  • Mertsj
In this problem you have three factors to multiply and the problem says that if you multiply them the result will be positive. Do you understand that?
anonymous
  • anonymous
Isk that because it has to be > 0?
Mertsj
  • Mertsj
Yes
Mertsj
  • Mertsj
And no you don't multiply them together.
anonymous
  • anonymous
One of the choices of answers I had was all natural numbers. Would that be correct?
Mertsj
  • Mertsj
No
Mertsj
  • Mertsj
If you multiply 3 numbers and get a positive answer that can only happen in two ways: All three factors are positive OR Exactly 2 factors negative and 1 positive
anonymous
  • anonymous
Ok, maybe you can help me with this one. I need to make this problem into decimal places. The square root of 25/48=T, I am trying to find the hang time of a basketball player from the vertical leap 25 inches, the function is V=48T^2
Mertsj
  • Mertsj
divide 25 by 48 on your calculator and then hit the square root button
Mertsj
  • Mertsj
T=.721689836
anonymous
  • anonymous
That is not what my calculator just gave me? Do I need to do this problem on a scientific calculator?
Mertsj
  • Mertsj
No. Perhaps you need to enter it in a different order. Calculators vary. So try this: Push the square root key and then enter (25 divided by 48) equals
anonymous
  • anonymous
I tried it on the scientific calcualtor on my computer and still came up with the same. Can you check your answer for me please?
Mertsj
  • Mertsj
You can check my answer. Just multiply .721687836 by itself and see if you get the same thing as when you divide 25 by 48
anonymous
  • anonymous
I did on my cell phone calculator and got what you got. This is funny...
Mertsj
  • Mertsj
Define funny
anonymous
  • anonymous
Just a smile.

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