1.

यदि `z_(1) = 2 - i, |(z_(1) + z_(2) + 1)/(z_(1) - z_(2) + i)|` का मान ज्ञात कीजिए।

Answer» `z_(1) = 2 -I, z_(2) = 1 + i`, तब
`(z_(1) + z_(2) + 1)/(z_(1) - z_(2) + i) = (2 -i + 1 + i + 1)/(2-i-1-i+i) = (4)/(1-i)`
`= (4(1 +i))/((1 -i) (1+i)) = (4 + 4i)/(1 + 1)`
`= (4 + 4i)/(2) =2 + 2i`
`:. |(z_(1) + z_(2) + 1)/(z_(1) -z_(2) + i)| = |2 + 2i|`
`= sqrt((2)^(2) + (2)^(2)) = sqrt8 = 2 sqrt2`


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