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5. Complex Numbers and Quadratic Equations
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Q26 of 66 Page 91

State True of False for the following:

The inequality |z – 4| < |z – 2| represents the region given by x > 3.

True

Explanation:


Given |z – 4| < |z – 2|


Putting z = x + iy,


⇒ |x – 4 + iy| < |x – 2 + iy|



⇒ (x – 4)2 + y2 < (x – 2)2 + y2


⇒ x2 – 8x + 16 + y2 < x2 – 4x + 4 + y2


⇒ -8x + 16 < -4x + 4


⇒ 4x > 12


∴ x > 3


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26

State True of False for the following:

The locus represented by |z – 1| = |z – i| is a line perpendicular to the join of (1, 0) and (0, 1).

26

State True of False for the following:

If z is a complex number such that z ≠ 0 and Re (z) = 0, then Im (z2) = 0.

26

State True of False for the following:

Let z1 and z2 be two complex numbers such that |z1 + z2| = |z1| + |z2|, then arg (z1 – z2) = 0.

26

State True of False for the following:

2 is not a complex number.

Questions · 66
5. Complex Numbers and Quadratic Equations
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