If line 2x-1=0 is directrix of parabola y^2 - kx + 6 = 0, value of k is?  [4 or -6]

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Please find below the solution to the asked query:

2x=1 is directrixi.e. x=12...iWe havey2-kx+6=0y2=kx-6y2=kx-6kCompare with Y2=4aX4a=ka=k4X=-ax-6k=-k4x=-k4+6k-k4+6k=12-k2+24=2kk2+2k-24=0k2+6k-4k-24=0kk+6-4k+6=0k-4k+6=0k=4 or k=-6 Answer

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