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If b, c are intercepts of a focal chord of the parabola y^2 = 4ax then c is equal to

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If b, c are intercepts of a focal chord of the parabola y2 = 4ax then c is equal to

(a)  b/b - a

(b)  a/b - a

(c)  ab/a - b

(d)  ab/b - c

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Best answer

Correct option  (c)  ab/a - b = c

Explanation:

We know that 2a = 2xSAxSB/SA + SB

2a = 2bc/b + c

ab + ac = bc

ab/a - b = c

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