## anonymous 5 years ago what is the distance from (-7,4) to (-9,2)?

1. anonymous

distance= $\sqrt{(-7+9)^2+(4-2)^2}$

2. anonymous

sum of the square of the differnce between x and y coordinates of the points

3. anonymous

do the square and the square root cancel each other out?

4. anonymous

no no

5. anonymous

inside the sqrt there r two terms adding up

6. anonymous

simplify those first

7. anonymous

sqrt(4+4)=sqrt(8) =2sqrt(2)

Right, remember you can't cancel two squares that are added together with a square root; only if they're multiplied together :)

9. anonymous

The answer is $2\sqrt{2} ?$