Løs z2=−9z^2 = -9z2=−9.
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−9=9eiπ-9 = 9e^{i\pi}−9=9eiπ, 9=3\sqrt{9} = 39=3. Røttene: 3ei(π+2πk)/23e^{i(\pi + 2\pi k)/2}3ei(π+2πk)/2 for k=0,1k=0,1k=0,1: $3eiπ/2=3i,3ei3π/2=−3i.3e^{i\pi/2} = 3i, \quad 3e^{i 3\pi/2} = -3i.3eiπ/2=3i,3ei3π/2=−3i.$
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