Find all points on the x-axis that are 10 units from the point (7, 6). (Hint: First write the distance formula with (7, 6) as one of the points and (x, 0) as the other point.)

Answer 1

√( (x-7)^2 + (0-6)^2 ) = 10
square both sides and expand
x^2 - 14x + 49 + 36 = 100
x^2 - 14x - 15 = 0
(x - 15)(x + 1) = 0
x = 15 or x = -1

interpret my results.

Answer 2

-1include or not