Question

What is the exact distance from (−4, −2) to (4, 6)?

Answer 1

If I remember correctly, I think the answer is the square root of 128.

Answer 2

The distance between any two points is:

d^2=(x2-x1)^2+(y2-y1)^2

d^2=(6--2)^2+(4--4)^2

d^2=8^2+8^2

d^2=64+64

d^2=128

d=√128 units