## jabbers! 2 years ago find the distance (-1,2) (2,-4)

1. AravindG

use distance formula

use the formula : d = sqrt((y2-y1)^2 + (x2-x1)^2)

3. AravindG

$distance=\sqrt{(x_2-x_1)^2+(y_2-y_1)^2}$

4. jabbers!

I don't understand how! I need help please?

5. msingh

|dw:1359221133669:dw|

6. AravindG

take (-1,2) as $$(x_1,y_1)$$ take (2,-4) as $$(x_2,y_2)$$

7. AravindG

then use the formula above

8. jabbers!

i need to know how to solve it!! i know the formula but i need an example

9. AravindG

ok

10. AravindG

find distance between (2,4) and (5,6)

11. RONNCC

(1,2) to (3,4) distance is sqrt((3-1)^2 + (4-2)^2) = sqrt(8)

12. RONNCC

this formula comes from pythagoreas, c^2 = a^2 + b^c

13. AravindG

|dw:1359221442540:dw|

14. AravindG

|dw:1359221484203:dw|

15. AravindG

understood ?@jabbers! ?

16. AravindG

@jabbers! ?

17. RONNCC

.... sigh. sidenote. things don't come automatically to most people - you have to read them and try to understand

18. jabbers!

where did 5 come from

19. AravindG

i took second point as (5,6)

20. jabbers!

second point is (2,-4)

21. AravindG

i was doing an example!!

22. AravindG

look above !

23. jabbers!

ok.

24. AravindG

now try to do your question ! :)

25. jabbers!

|dw:1359221710963:dw|

26. jabbers!

@AravindG

27. AravindG

what did u get ?

28. jabbers!

i put it in my calculator and got an error. @AravindG

29. jabbers!

i got $3\sqrt{5}$

30. AravindG

you are right !!

31. jabbers!

thank u. finally!