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COMEDKCOMEDK 2012Complex Numbers and Quadratic Equations
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Solution:
Let z=4−5i3+4i
we have to calculate z−1i.e.,z1 ∴z−1=z1=3+4i4−5i×3−4i3−4i =9−16i212−15i−16i+20i2=9−16(−1)12−31i−20 =9+16−8−31i=25−8−2531i ∴z−1=(25−8,25−31)