Find the coordinates of focus,the axis, the equation of the directrix and the length of the latus-rectum of the parabola represented by the equation y2=16x
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Solution
The given equation is y2=16x .......(1)
which is same as y2=4ax, so (1) represents standard parabola,and its axis lies along the x−axis.Hence x−axis itself is the axis of the given parabola.
Also,4a=16⇒a=164=4
∴ focus is (a,0)=(4,0) and the equation of the directrix is x+a=0