Jika titik P(m, 2), Q(1, -2) dimana m > 0, dan panjang PQ = 5, maka nilai m adalah .....

(m-1)^2 + (2-(-2))^3 = 5^2
(m-1)^2 + (2+2)^2 = 25
(m-1)^2 + 4^2 = 25
(m-1)^2 + 16 = 25
(m-1)^2 = 25 - 16
(m-1)^2 = 9
m - 1 = akar9
m - 1 = 3
m = 3 + 1
m = 4