find the magnitude and conjugate of the number (1/1-4i-2/1+i)

The question is not clear so I am assuming it to be 11-4i-21+i
z=11-4i-21+i=1+i-2+8i1-4i1+i=9i-11-4i+i-4i2=9i-15-3i=9i-15-3i×5+3i5+3i=45i-5+27i2-3i25+9=42i-3234=2117i-1617Conjugate of z=z'=-1617-2117iMagnitude of z=zz'=2117i-1617-1617-2117i=21172+-16172=441+256289=697289=4117

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