## hba 3 years ago If x^2-36>0,what are the possible values of x ?

1. hba

x^2>36 $x \ge \pm6$

2. hba

Options provided, A) x > 6 B) x < 6 C) x > -6 D) x <-6 or x >6

3. hba

@Rosh007 Yes ?

4. hba

5. hba

So x > +- 6

6. Otonashi

D

7. hba

Please check out the CoC- http://openstudy.com/code-of-conduct @Otonashi

8. Rosh007

mmmm... I am not sure about how it comes.. since it is inequality... have to refresh.. my memory...

9. hba

10. tamtoan

if you want to solve, try factor the x^2 - 36 ...and what condition make the product of 2 factors greater than zero ?...try that, you should come out with the right answer

11. hba

12. tamtoan

solving for you is not the right way to help you understand at all :)

13. Rosh007

but a method is there.... not by mathematical.. but by anaysis... you will b able to understand

14. nubeer

hmm honestly.. i dont remmeber how but option is D. u can say its trick the way i rmemeber when x<+-a then sol is -a<x<a when x>+-a then sol is x<-a and x>a

15. hba

@tamtoan I dont need the answer,i dont even care about the answer

16. Rosh007

it is best suited for inequality

17. hba

what will i do of the answer lol :D

18. hba

@Rosh007 Well it is fun to revise things back after 2 years,Rusted brains lol.

19. tamtoan

did you try factoring x^2 - 36 ? what are the 2 factors ?

20. hba

|dw:1353051849999:dw| Lets talk about the graph which makes me help understanding it.

21. Rosh007

@ha ha.... :)... by analyais it is a lot simpler... and may able to form mathematics from analysis too ;)

22. hba

Well i got it x >6 or x < -6

23. hba

The possible solutions . Thanks alot anyways.

24. Rosh007

:)

25. Rosh007

I wish I could give a best response to hba too... :(

26. hba

@Rosh007 give it to @tamtoan

27. tamtoan

rosh, (x-6)(x+6) > 0 ....this can only happen when both factors are possitive or both are negative

28. Rosh007

@hba yup.. I had given....... @tamtoan sure thanks I figured out..... & that is what hba got by analysis