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Asked Oct 22, 2019
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Hi, there are two questions a) and b) attached 

Thanks so Much!!!!

21. Given that z is a complex number satisfying |2z 1 |z - 2|, prove that |z|
(a) letting z = x + iy,
(b) squaring the equation and then using the result z2
1 by:
= 2z.
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21. Given that z is a complex number satisfying |2z 1 |z - 2|, prove that |z| (a) letting z = x + iy, (b) squaring the equation and then using the result z2 1 by: = 2z.

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Expert Answer

Step 1

Given that z is a complex number satisfying |2z – 1| = |z – 2|. We need to prove that |z| = 1 by two different methods.

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(a) By letting z= x + iy (b) By squaring the equation and then using the result |z|2=z z.

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Step 2

Now,

...
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(a) Let z x + iy. 12z - 1 z 2| And => |2(x + iy) -1 = |x iy 2| => |2x - 1 i2yl = |x - 2 + iy => (2x- 1)2 + (2y)2 = (x- 2)2+(y)2 => (2x 1)2 (2y)2 => 4x21- 4x + 4y2 =>3x2 3y2 = 3 => x2 + y2 = 1 => |z12 = 1 => |z= 1 (Since |z| can't be negative) (x- 2)2+(y)2 (Squaring both sides) x2 4 4x2 (Opening the squares)

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