## Kezia √(t-5) = 2 one year ago one year ago

1. Kezia

I'm confused about how to solve this?

2. myininaya

Square both sides to undo that radical. :) You are trying to get to the t so undo the things around it.

3. ajprincess

In order to solve for t u have to isolate t. 1.Square both sides 2.Add 5 to both sides.

4. Kezia

okay

5. Kezia

Then t = 9

6. TheViper

$\sqrt{t-5} = 2$ $t-5 = 4$ $t = ?$

7. ajprincess

yup perfect:)

8. TheViper

right :)

9. Kezia

Now what about one like x = √(56-x)

10. ajprincess

whenever u have square roots on one side try to remove them by squaring both sides. Can u plz tell me vat u get when u square both sides?

11. Kezia

x^2= 56 - x

12. Kezia

then would i use quadratic formula

13. ajprincess

yup right:) good work.:) Nw bring all the terms to one side. Then use quadratic formula to find x. Quadratic formula is $x=\frac{ -b\pm\sqrt{b^2-4ac} }{ 2a }$

14. Kezia

-8 and 7

15. Kezia

x = -8 and 7

16. ajprincess

yup perfect:) great work:)

17. Kezia

Thanks!

18. ajprincess

welcome:)