The parabola in the figure below has vertex (0, 0) and focus F (4, 0).
Its directrix is the vertical line that passes through (-4, 0).
The point R (x, y) is a point on the parabola that is above and to the right of the focus. The point I lies on the directrix, and RT is
perpendicular to the directrix.
(-4,0)
R(x3)
(4.0)
(a) What are the coordinates for the point T?
(Choose one)▼
(b) Write the expressions for the distances FR and TR.
FR=
=0
TR =
(c) From the definition of a parabola, which of the following must be
true?
(Choose one)
(d) Use the above to write an equation for the given parabola solved
for y².
y = 0