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Perform the indicated operation and find...

Perform the indicated operation and find the result in the form `a+i bdot`
`(i) (2-sqrt(-25))/(1-sqrt(-16))` (ii) `(3-sqrt(-16))/(1-sqrt(-9))`

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Verified by Experts

`(2-sqrt(-25))/(1+sqrt(-16)) = (2-i5)/(1+4i)`

=`(2-i5)/(1+i4)xx(1-i4)/(1-i4)`

=`(2-i*8-i*5+i^2*20)/((1)^2-i^2*4^2)` ...
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RD SHARMA-COMPLEX NUMBERS-Solved Examples And Exercises
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  2. If (1+i)(1+2i)(1+3i)........(1+n i)=a+i b ,t h e n2xx5xx10 ....(1+n^2)...

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  3. Perform the indicated operation and find the result in the form a+i bd...

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  4. Let z1=2-i ,""""z2=-2+i . Find (i) Re ((z1z2)/( bar z1)) (ii) Im(1...

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  5. Which of the following is correct for any tow complex numbers z1a n dz...

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  6. If z1a n dz2 are two complex numbers such that |z1|=|z2|a n d arg(z1)...

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  7. Evaluate sum(n=1)^(13)(i^n+i^(n+1)), where n in Ndot

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  8. Find the value of 1+i^(2)+i^(4)+i^(6)+...+i^(2n),

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  9. Show that: {i^(19)+(1/i)^(25)}^2=-4 (ii) {i^(17)-(1/i)^(34)}^2=2i (ii...

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  10. Prove that the following complex numbers are purely real: (i)((2+3i)/...

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  11. Show that 1+i^(10)+i^(20)+i^(30) is a real number.

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  12. Find the values of following expressions: i^(49)+i^(68)+i^(89)+i^(110)...

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  13. If (a+i b)(c+i d)(e+if)(g+i h)=A+i B prove that (a^2+b^2)(c^2+d^2)(e...

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  14. If z1, z2 are complex number such that (2z1)/(3z2) is purely imaginary...

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  15. If x=-5+2sqrt(-4) , find the value of x^4+9x^3+35 x^2-x+4.

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  16. If z is a complex number such that |z|=1, prove that (z-1)/(z+1) is pu...

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  17. If z=x+i y and w=(1-i z)/(z-i) , show that |w|=1 z is purely real.

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  18. If z=2-3i show that z^2-4z+13=0 and hence find the value of 4z^3-3z^...

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  19. If |z1|=|z2|=.......=|zn|=1, prove that |z1+z2+z3++zn|=1/(z1)+1/(z2)+...

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  20. Find the non-zero complex numbers z satisfying barz =i z^2dot

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