alleryStart learning →For complex numbers z1 and z2, which expression equals (z1 + z2)²?
Az1² + z2² − z1z2
Bz1² − 2z1z2 + z2²
Cz1² + z2² + z1z2
Dz1² + 2z1z2 + z2²
Answer & Solution
Correct answer: D. z1² + 2z1z2 + z2²
The algebraic identity for the square of a sum holds for complex numbers because they obey the commutative and distributive laws.
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