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Find the modulus of the following comple...

Find the modulus of the following complex numbers
`(2+3i)/(3+2i)`

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To find the modulus of the complex number \(\frac{2 + 3i}{3 + 2i}\), we will follow these steps: ### Step 1: Rationalize the denominator To simplify the expression, we multiply the numerator and the denominator by the conjugate of the denominator. The conjugate of \(3 + 2i\) is \(3 - 2i\). \[ \frac{2 + 3i}{3 + 2i} \cdot \frac{3 - 2i}{3 - 2i} = \frac{(2 + 3i)(3 - 2i)}{(3 + 2i)(3 - 2i)} \] ### Step 2: Calculate the denominator Using the identity \( (a + b)(a - b) = a^2 - b^2 \): \[ (3 + 2i)(3 - 2i) = 3^2 - (2i)^2 = 9 - 4(-1) = 9 + 4 = 13 \] ### Step 3: Calculate the numerator Now we expand the numerator: \[ (2 + 3i)(3 - 2i) = 2 \cdot 3 + 2 \cdot (-2i) + 3i \cdot 3 + 3i \cdot (-2i) \] Calculating each term: - \(2 \cdot 3 = 6\) - \(2 \cdot (-2i) = -4i\) - \(3i \cdot 3 = 9i\) - \(3i \cdot (-2i) = -6i^2 = 6\) (since \(i^2 = -1\)) Now combine these: \[ 6 - 4i + 9i + 6 = (6 + 6) + (-4i + 9i) = 12 + 5i \] ### Step 4: Combine the results Now we can write the expression as: \[ \frac{12 + 5i}{13} \] This can be separated into real and imaginary parts: \[ \frac{12}{13} + \frac{5}{13}i \] ### Step 5: Find the modulus The modulus of a complex number \(a + bi\) is given by: \[ |z| = \sqrt{a^2 + b^2} \] Here, \(a = \frac{12}{13}\) and \(b = \frac{5}{13}\): \[ |z| = \sqrt{\left(\frac{12}{13}\right)^2 + \left(\frac{5}{13}\right)^2} \] Calculating each square: \[ |z| = \sqrt{\frac{144}{169} + \frac{25}{169}} = \sqrt{\frac{144 + 25}{169}} = \sqrt{\frac{169}{169}} = \sqrt{1} = 1 \] ### Conclusion Thus, the modulus of the complex number \(\frac{2 + 3i}{3 + 2i}\) is: \[ \boxed{1} \]
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ICSE-COMPLEX NUMBERS-Chapter Test
  1. Find the modulus of the following complex numbers (2+3i)/(3+2i)

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  2. Find the square root of 5-12i

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  3. Find the locus of a complex number z=x +yi, satisfying the relation |z...

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  4. Express (13i)/(2-3i) in the form A + Bi

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  5. If z= x +yi and (|z-1-i|+4)/(3|z-1-i|-2)=1, show that x^(2) + y^(2) -2...

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  6. If omega and omega^(2) are cube roots of unity, prove that (2- omega +...

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  7. If z(1), z(2) in C (set of complex numbers), prove that |z(1) + z(2)| ...

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  8. If z = x + yi, omega = (2-iz)/(2z-i) and |omega|=1, find the locus of ...

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  9. Simplify: (1- 3omega + omega^(2)) (1 + omega- 3omega^(2))

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  10. Find the locus of z satisfying |(z-3)/(z+1)|=3 in the complex plane.

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  11. Given that (2 sqrt3 cos 30^(@) - 2i sin 30^(@))/(sqrt2 (cos 45^(@) + i...

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  12. Simplify : (1- omega) (1- omega^(2)) (1- omega^(4)) (1- omega^(8))

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  13. Find the locus of a complex number z= x + yi, satisfying the relation ...

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  14. Find the real values of x and y satisfying the equality (x-2 + (y-3)i)...

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  15. If i= (sqrt-1), prove that following (x+1+i) (x+ 1-i) (x-1-i) (x-1+ i)...

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  16. If z= x + yi and |2z + 1| = |z- 2i|, show that 3(x^(2) + y^(2)) + 4(x-...

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  17. Find the amplitude of the complex number "sin" (6pi)/(5) + i (1- "cos"...

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  18. Express (1- 2i)/(2+i) + (3+i)/(2-i) in the form a + bi

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  19. Find the value of x and y given that (x + yi) (2-3i)=4+i

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  20. If the ratio (z-i)/(z-1) is purely imaginary, prove that the point z l...

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  21. If (-2 + sqrt-3) (-3 + 2 sqrt-3) = a + bi, find the real numbers a and...

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