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If (1 + i) = (1 - i) overline (z) then z...

If `(1 + i) = (1 - i) overline (z)` then z is :

A

`t(1-i), t in R`

B

`t(1+i),t in R`

C

`t/(1+i),t in R^(+)`

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
A

We have,
`(1+i)z=(1-i)barz`
`rArr (1+i)z=bar((1+i)z)`
`rArr z(1+i)=alpha`, where `alpha in R`
`rArr z=alpha/(1+i)`, Where `alpha in R`
`rArr z=t(1-i)`, where `t=alpha//2 in R`
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OBJECTIVE RD SHARMA ENGLISH-COMPLEX NUMBERS -Section I - Solved Mcqs
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  2. If (sqrt(3)-i)^n=2^n, n in I, the set of integers, then n is a multipl...

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  3. If (1 + i) = (1 - i) overline (z) then z is :

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  4. Let z=(costheta+isintheta)/(costheta-isintheta), pi/4 lt theta lt pi/...

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  5. If arg(z) lt 0, then find arg(-z) -arg(z).

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  7. If z=a+ib satisfies "arg"(z-1)="arg"(z+3i), then (a-1):b=

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  8. If the area of the triangle on the complex plane formed by the points ...

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  9. If the area of the triangle on the complex plane formed by complex num...

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  11. If x^(2)-x=1=0 C sum(n=1) ^(5) (x^(n) + 1/x^(n))^(2) is :

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  12. The value of alpha^(-n)+alpha^(-2n), n in N and alpha is a non-real cu...

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  13. If a is a non-real fourth root of unity, then the value of alpha^(4n-1...

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  14. If 1,alpha,alpha^(2),……….,alpha^(n-1) are n^(th) root of unity, the va...

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  15. If omega is an imaginary cube root of unity, then show that (1-omega)(...

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  16. If alpha is a non-real fifth root of unity, then the value of 3^(|1+a...

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  17. If Zr=cos((2rpi)/5)+isin((2rpi)/5),r=0,1,2,3,4,... then z1z2z3z4z5 is...

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  18. z is a complex number satisfying z^(4)+z^(3)+2z^(2)+z+1=0, then |z| is...

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  19. if (5z2)/(7z1) is purely imaginary number then |(2z1+3z2)/(2z1-3z2) |...

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