## laurenn_marie7 2 years ago x^2-81=0

1. GaLm

factor or solve for x?

2. laurenn_marie7

solve

3. ZeHanz

Then first factor, then solve ;)

4. Fgcbear16

|dw:1360688492604:dw|

5. ZeHanz

Hey @GaLm, just throwing in solutions isn't very helpful!

6. Fgcbear16

|dw:1360688526731:dw|

7. GaLm

|dw:1360688525132:dw|

8. Fgcbear16

be careful you must take the positive and negative square root.

9. ZeHanz

Why not do it this way: x²-81=0 (x+9)(x-9)=0 x+9=0 or x-9=0 x=-9 or x=9

10. GaLm

ok, cause its longer,

11. Fgcbear16

There are many ways to do one problem. It all depends on your preference.

12. ZeHanz

Could have left out some steps... It's not longer, it depends on recognising the difference of two squares. That is why you practised factoring. Now it can help you solve equations. You're free to do it your way!

13. GaLm

short is better

14. Fgcbear16

Arguing over this isn't helping. Also it is against the rules to give just answers. @GaLm

15. GaLm

whatever

16. GaLm

@laurenn_marie7 , did it help?

17. Fgcbear16

Did you understand any of this? I can try to explain if you like.