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جستجوهای پرتکرار

میتونی لایو بذاری!

The complex number $w$ is defined by $w =  - 1 + i$.

a) Find the modulus and argument of ${w^2}$ and ${w^3}$, showing your working.

b) The points in an Argand diagram representing $w$ and ${w^2}$ are the ends of a diameter of a circle. Find the equation of the circle, giving your answer in the form $\left| {z - \left( {\alpha  + bi} \right)} \right| = k$.

پاسخ تشریحی :
نمایش پاسخ

a) Use correct method for finding modulus of their ${w^2}$ or ${w^3}$ or both

Obtain $\left| {{w^2}} \right| = 2$ and $\left| {{w^3}} \right| = 2\sqrt 2 $ or equivalent

Use correct method for finding argument of their ${w^2}$ or ${w^3}$ or both

Obtain arg $\left( {{w^2}} \right) =  - \frac{1}{2}\pi $ or $\frac{3}{2}\pi $ and arg $\left( {{w^3}} \right) = \frac{1}{4}\pi $

b) Obtain centre $ - \frac{1}{2} - \frac{1}{2}i$

Calculate the diameter or radius using $\left| {w - {w^2}} \right|$ $w21$ or right-angled triangle

or cosine rule or equivalent

Obtain radius $\frac{1}{2}\sqrt {10} $ or equivalent

Obtain $\left| {z + \frac{1}{2} + \frac{1}{2}i} \right| = \frac{1}{2}\sqrt {10} $ or equivalent

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