The value of 12−3i+7+8i is
12−3i=12−3i×2+3i2+3i =2+3i13 12−3i+7+8i=2+3i13+7+8i =(2+3i)+91+104i13 =93+107i13
if z1= 7-3i, z2= 3 + root3 i , z3=4-8i, then find z1z2z3.