algebra
posted by teri .
find the possible values of a, if the distance between the points is 5, and the coordinates are (1,1) and (4,a)

d^2 = (a1)^2 + 9 = 25
a^2 2a + 10 = 25
a^2  2a = 15
a^2  2a  15 = 0
a = [ 2 +/ sqrt(64))/2
a = 2+/ 8
a = 10 or 6