A & # 178; + B & # 178; + ab ≥ 0

A & # 178; + B & # 178; + ab ≥ 0

In the range of real number, because a & # 178; + B & # 178; + AB = (a + 1 / 2b) &# 178; + 3 / 4B & # 178; > 0
But imaginary numbers are not necessarily