Find the constant k if 2x -1 is a factor of f(x) = 4x2+kx +1.Using this value of k, factorise f(x) completely.

fx=4x2+kx+12x-1 is a factor of fx2x-1=0x=12so, f12=04122+k12+1=01+k2+1=0k2=-2k=-4   ANS...fx=4x2-4x+1=4x2-2x-2x+1=2x2x-1-12x-1=2x-12x-1   ANS...

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