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Question

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 xaxis.Hence xaxis itself is the axis of the given parabola.
Also,4a=16a=164=4
focus is (a,0)=(4,0) and the equation of the directrix is x+a=0
x+4=0
Length of the latus rectum=4a=4×4=16

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