If z1 =1-i and z2=-2+4i find z1z2/z1.there is a bar over z1

Dear student
Given: z1=1-iand z2=-2+4iConsider,z1z2z1¯=1-i-2+4i1-i¯=-2+4i+2i-4i21+i=-2+6i+41+i   i2=-1=2+6i1+i=2+6i1+i×1-i1-i=2-2i+6i-6i21-i2=2+4i+61+1=8+4i2=4+2i
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