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PSQ is a focal chord of the parabola y^2...

PSQ is a focal chord of the parabola `y^2=8xdotIf\ S P=6,` then write SQ.

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Since the semi-latus rectum of a parabola is the harmonic mean between the segments of any focal chord of a parabola, therefore `SP, 4, SQ` are in `H.P`.
`4=2frac{SP.SQ}{SP+SQ}`
`4=frac{2(6)(SQ)}{6+SQ}`
`SQ=3`
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