hi guys , i really need help in these two questions :

Express each of the following in the forma+iband also in the polar formr\µ,

where the angle is the principal value.

(a) (-sqrt(3)- i )^7

(b)(1 +i)^3(sqrt(3) +i)^3

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- May 13th 2010, 01:52 PMsandyPolar form of complex numbers
hi guys , i really need help in these two questions :

Express each of the following in the form*a*+*ib*and also in the polar form*r*\*µ*,

where the angle is the principal value.

(a) (-sqrt(3)- i )^7

(b)(1 +*i*)^3(sqrt(3) +*i*)^3

- May 13th 2010, 02:08 PMpickslidesStart by using this, where $\displaystyle z = x+yi$ then $\displaystyle (x+yi)^n = z^n = r^n(\cos n\theta +i\sin n\theta)$

given $\displaystyle r = \sqrt{x^2+y^2}$ and $\displaystyle \theta = \tan^{-1}\frac{y}{x}$ - May 13th 2010, 07:51 PMsandyhi
i did start with that but im notgetting the right answer i dont know what im doing wrong

- May 13th 2010, 08:00 PMmr fantastic
- May 14th 2010, 03:42 PMsandy
- May 14th 2010, 03:56 PMpickslides
- May 14th 2010, 03:56 PMsandy
- May 14th 2010, 04:00 PMsandy
- May 14th 2010, 04:12 PMsandy