z = √2 - √2i
z² = (√2 - √2i)² = (√2)² - 2.√2.√2.i + (√2i)² = 2 - 4i - 2 = -4i
z⁴ = (z²)² = (-4i)² = 16.i² = 16.(-1) = -16
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Verified answer
z = √2 - √2i
z² = (√2 - √2i)² = (√2)² - 2.√2.√2.i + (√2i)² = 2 - 4i - 2 = -4i
z⁴ = (z²)² = (-4i)² = 16.i² = 16.(-1) = -16