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Question

Q. Find the equation of the parabola with latus rectum joining the points (2,4) and (2,-2)

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Solution

Dear Student,

Since the latus rectum passes through the points 2,4 and 2,-2therefore, the length of the latus rectum is given by Distance Formula,i,e 2-22+-2-42=62=6now the equation of the parabola is given by,y-b2=6x-a2Since the parabola passes through 2,4 and 2,-24-b2=62-a2 ---(1)and,-2-b2=62-a2 ---(2)Subtracting equn (2) from (1), we get;4-b2--2-b2=016+b2-8b-4+b2+4b=016-4-8b-4b+b2+b2=012-12b=0b=1,now in eqn (1)4-12=62-a232=64+a2-4a9=24+6a2-24a6a2-24a+15=02a2-8a+5=0Using D-method to solve=we get,a=8±244a=4±62Now, the eqn of the parabola is;y-12=6x-4±622

Rgards.

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