Question

Find the distance d(A,B) between points A and B
A(7,8) B(-1,23)

Answer 1

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

Answer 2

yes

Answer 3

sqrt(8^2+15^2)=17

Answer 4

\[d=\sqrt{(23-8)^{2}+(-1-7)^{2}}=\sqrt{225+64}=\sqrt{289}=17\]

Answer 5

dipankarstudy - btw, at the college level student probably can understand negative means the opposite of a number but in middle school and even high school sometimes they think it means the number must be negative

Answer 6

opposite of a number? why?

Answer 7

i used reciprocal instead of opposite.

Answer 8

and i'm extremely sorry if it made any confusion.

Answer 9

Callisto - we are talking about the slope of a perpendicular line. I teach it as opposite reciprocal because students can misinterpret negative reciprocal to mean a negative number.

Answer 10

huh, that would be more confusing actually..but thanks