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If a, b are real, prove that the equatio...

If a, b are real, prove that the equation `z^2`+az+b=0 will not have any purely real solution if `a^2`< 4b.

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A DAS GUPTA-COMPLEX NUMBERS-EXERCISE
  1. Find the value of w^4+w^6+w^8, if w is a complex cube root of unity.

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  2. Find the range of real number alpha for which the equation z+alpha|z-1...

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  3. If a, b are real, prove that the equation z^2+az+b=0 will not have any...

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  4. Find the maximum and minimum values of |z| satisfying |z+(1)/(z)|=2

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  5. If |z|ge3, then determine the least value of |z+(1)/(z)|.

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  6. If z is a complex number such that |z+1/z|=1 show that Re(z)=0 when |z...

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  7. Locate the region in the Argand plane for the complex number z satisfy...

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  8. Indicate the region represented by pi/6leargzlepi/4 .

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  9. Indicate the region in the Argand plane respresented by |z+1|^2+|z-1|^...

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  10. Prove that the product of any number of unimodular complex numbers is ...

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  11. Separate the real and imaginary parts of frac((cosalpha+isinalpha)(cos...

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  12. Prove that (frac(1+costheta+isintheta)(1+costheta-isintheta))^n=cos nt...

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  13. If alpha=pi/12 ,prove that frac((cosalpha+isinalpha)(cos2alpha+isin2al...

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  14. Prove that (frac(cosx+isinx)(sinx+icosx))^5=cos(10x-frac(5pi)(2))+isin...

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  15. Find the value of : root(4)(1).

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  16. Find the value of : 1^(1//5).

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  17. Find the value of : (1-i)^(1//3).

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  18. Find the value of : (1-sqrt3i)^(2//5).

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  19. Find the value of : root(4)(-64).

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  20. Find the value of : (1+i)^n, n inN

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