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If z1=2-i ,\ z2=1+i , find |(z1+z2+1)/(z...

If `z_1=2-i ,\ z_2=1+i ,` find `|(z_1+z_2+1)/(z_1-z_2+i)|`.

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Given `z_1=2-i ,\ z_2=1+i ,`
And we have to find
`|(z_1+z_2+1)/(z_1-z_2+i)|`
So on putting values in this we get,
`|(z_1+z_2+1)/(z_1-z_2+i)|=|((2-i)+(1+i)+1)/((2-i)-(1+i)+i)|`
`|(z_1+z_2+1)/(z_1-z_2+i)|=|(2-i+1+i+1)/(2-i-1-i+i)|`
`|(z_1+z_2+1)/(z_1-z_2+i)|=|4/(1-i)|`
Now multiply and divide this by (1+i) we get,
...
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RD SHARMA-COMPLEX NUMBERS-Solved Examples And Exercises
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  2. Find the multiplicative of the following complex number: sqrt(5)+3i

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  3. If z1=2-i ,\ z2=1+i , find |(z1+z2+1)/(z1-z2+i)|.

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  4. If z1=2-i ,\ z2=-2+i , find : R e((z1z2)/bar(z1))

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  5. If z1=2-i ,\ z2=-2+i , find : Im(1/(z1bar(z1))).

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  6. Find the modulus of (1+i)/(1-i)-(1-i)/(1+i)

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  7. If x+i y=(a+i b)/(a-i b) prove that x^2+y^2=1

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  8. Write the least positive integral value of n for which ((1+i)/(1-i))^n...

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  9. Find the real values of theta for which the complex number (1+i costhe...

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  10. Find the smallest positive integer value of n for which ((1+i)^n)/((1-...

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  11. If ((1+i)/(1-i))^3-((1-i)/(1+i))^3=x+i y ,\ find\ (x , y)

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  12. If ((1-i)/(1+i))^(100)=a+i b , find(a , b)

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  13. Evaluate the following: 2x^3+2x^2-7x+72 ,\ w h e n\ x=(3-5i)/2

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  14. Evaluate x^4-4x^3 + 4x^2 + 8x + 44, when x = 3 + 2i

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  15. Evaluate the following:\ x^4+4x^3+6x^2+4x+9,\ w h e n\ x=-1+isqrt(2)

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  16. Evaluate the following: x^6+x^4+x^2+1,\ w h e n\ x=(1+i)/(sqrt(2))

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  17. Evaluate the following: \ 2x^4+5x^3+7x^2-x+41 ,\ w h e n\ x=-2-sqrt(3)...

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  18. If z1 is a complex number other than -1 such that |z1|=1\ a n d\ z2=(z...

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  19. Solve the system of equations R e(z^2)=0,\ |z|=2

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  20. If |z+1|=z+2(1+i), find zdot

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