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Statement-1: If a,b,c are distinct real ...

Statement-1: If a,b,c are distinct real number and `omega( ne 1)` is a cube root of unity, then `|(a+bomega+comega^(2))/(aomega^(2)+b+comega)|=1` Statement-2: For any non-zero complex number `z,|z / bar z)|=1

A

Statement-1 is True, Statement-2 is True: Statement-2 is a correct exp,anation for statement-1.

B

Statement-1 is true, statement -2 is true, Statement-2 is not a correct explanation for statement-1.

C

Statement-1 is True, statement-2 is false,

D

statement-1 is False, Statement-2 is true.

Text Solution

AI Generated Solution

The correct Answer is:
To solve the given problem, we need to analyze both statements and show that Statement 1 is true and Statement 2 is also true. ### Step-by-Step Solution: **Step 1: Understanding the cube roots of unity** The cube roots of unity are given by: - \( \omega = e^{2\pi i / 3} \) - \( \omega^2 = e^{-2\pi i / 3} \) - \( \omega^3 = 1 \) We know that \( 1 + \omega + \omega^2 = 0 \). **Step 2: Define the expression** Let: \[ z = a + b\omega + c\omega^2 \] We need to show that: \[ \left| \frac{z}{a\omega^2 + b + c\omega} \right| = 1 \] **Step 3: Multiply both sides by \( \omega^2 \)** Multiply both the numerator and the denominator by \( \omega^2 \): \[ z \omega^2 = (a + b\omega + c\omega^2) \omega^2 = a\omega^2 + b\omega^3 + c\omega^4 \] Since \( \omega^3 = 1 \) and \( \omega^4 = \omega \), we can rewrite this as: \[ z \omega^2 = a\omega^2 + b + c\omega \] **Step 4: Substitute in the original expression** Now, substituting back into our expression: \[ \left| \frac{z}{a\omega^2 + b + c\omega} \right| = \left| \frac{z \omega^2}{z} \right| = \left| \frac{z \omega^2}{z} \right| = \left| \omega^2 \right| \] **Step 5: Calculate the modulus** Since \( |\omega| = 1 \): \[ |\omega^2| = 1 \] Thus: \[ \left| \frac{z}{a\omega^2 + b + c\omega} \right| = 1 \] **Conclusion for Statement 1:** Statement 1 is true. --- **Step 6: Analyze Statement 2** Statement 2 states: \[ \left| \frac{z}{\bar{z}} \right| = 1 \] for any non-zero complex number \( z \). **Step 7: Understanding the modulus of a complex number and its conjugate** For any complex number \( z = x + iy \): \[ \bar{z} = x - iy \] The modulus of \( z \) is: \[ |z| = \sqrt{x^2 + y^2} \] And the modulus of \( \bar{z} \) is also: \[ |\bar{z}| = \sqrt{x^2 + y^2} \] **Step 8: Calculate the modulus of the ratio** Thus: \[ \left| \frac{z}{\bar{z}} \right| = \frac{|z|}{|\bar{z}|} = \frac{|z|}{|z|} = 1 \] **Conclusion for Statement 2:** Statement 2 is also true. --- ### Final Conclusion: Both Statement 1 and Statement 2 are true.
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