## anonymous 4 years ago (x+16)(x-12)(x+2)>0

1. anonymous

2x(8-6+1)>0

2. anonymous

(x>0)2(8-6+1)

3. Mertsj

Make a sign graph of the factors. Do you need me to demonstrate?

4. 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.

5. Mertsj

|dw:1327194029245:dw|

6. Mertsj

The chart shows that the factor x+16 is negative to the left of -16 and positive to the right.

7. Mertsj

Do you understand that?

8. anonymous

|dw:1327194152861:dw|

9. Mertsj

Ok, Walee, balaa wants to take over now. I'll let him explain it to you.

10. anonymous

|dw:1327194276321:dw|

11. anonymous

Ok so I don't have to multiply them at all?

12. anonymous

Yes

13. anonymous

Have you got it ?

14. anonymous

No, I do understand what is being said but I don't understand how.

15. Mertsj

Do you want me to explain it ?

16. anonymous

Yes, please. I don't multiply those three together?

17. 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?

18. anonymous

Isk that because it has to be > 0?

19. Mertsj

Yes

20. Mertsj

And no you don't multiply them together.

21. anonymous

One of the choices of answers I had was all natural numbers. Would that be correct?

22. Mertsj

No

23. 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

24. 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

25. Mertsj

divide 25 by 48 on your calculator and then hit the square root button

26. Mertsj

T=.721689836

27. anonymous

That is not what my calculator just gave me? Do I need to do this problem on a scientific calculator?

28. 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

29. 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?

30. 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

31. anonymous

I did on my cell phone calculator and got what you got. This is funny...

32. Mertsj

Define funny

33. anonymous

Just a smile.