## cbrusoe 3 years ago 121+x^2=225 what does x equal?

1. JamesWolf

so you want to get the x on its own. try subtracting 121 from both sides first

2. cbrusoe

104

3. JamesWolf

yeah, x^2 = 104

4. JamesWolf

now you need to get rid of the ^2

5. cbrusoe

mmk how do i do that?

6. mickey4691

what is the opposite of ^2?

7. JamesWolf

okay well whats the opposite of squaring something?

8. mickey4691

remember it's $\pm \sqrt{104}$

9. cbrusoe

ooh nevermind went blank i would square root it making x = 10.2 right

10. CheetahBooks1

121+x^2=225 -121 -121 x^2=104 square root x square root 104 X=10.2 approximately

11. JamesWolf

yeah awesome :)

12. cbrusoe

=) thank-you guys!!

13. mickey4691

but it's gonna be a positive or negative 10.2

14. CheetahBooks1

Aww man! she got it! oh well, congratulations! That's how you would show your work.

15. cbrusoe

positive right...

16. cbrusoe

lol thanks =)

17. CheetahBooks1

It can actually be positive and negative!

18. JamesWolf

could be either, but i doubt your teacher will care at this stage

19. mickey4691

it can be positive and negative check it wit the calculator yu shud use positive for now

20. cbrusoe

haha yeahh i got it right =) thanks again all of you

21. CheetahBooks1

You are welcome!