Respuesta :

Photon
The formula of a distance between two points A and B is : 

[tex] AB=\sqrt{(x_{B}- x_{A})^2 +( y_{B}- y_{A})^2 } [/tex]

You should this formula by heart.

Then, you just have to apply it ! :D

Here :

[tex] x_{A}=-5 [/tex]
[tex] y_{A} =0[/tex]

[tex] x_{B} =-4[/tex]
[tex] y_{B}= 1[/tex]

Therefore :

[tex] \sqrt{(-4-(-5))^2+(1-0)^2} [/tex]
[tex]= \sqrt{1^2+1^2} [/tex]
[tex]= \sqrt{1+1} [/tex]
[tex]= \sqrt{2} [/tex]

In short, the answer would be the first option : [tex] \sqrt{2} [/tex].

Hope this helps !

Photon

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