Let z₁ = 3 - 4i and z₂ = 1 + 2i, where i² = -1 - Leaving Cert Mathematics - Question 1 - 2013
Question 1
Let z₁ = 3 - 4i and z₂ = 1 + 2i, where i² = -1.
(a) Plot z₁ and z₂ on the Argand diagram over.
(b) From your diagram, is it possible to say that |z₁| > |z₂| ?
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Worked Solution & Example Answer:Let z₁ = 3 - 4i and z₂ = 1 + 2i, where i² = -1 - Leaving Cert Mathematics - Question 1 - 2013
Step 1
Plot z₁ and z₂ on the Argand diagram.
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Answer
To plot, we take the real and imaginary parts of z₁ and z₂:
For z₁ = 3 - 4i, the point is at (3, -4).
For z₂ = 1 + 2i, the point is at (1, 2).
These coordinates can be plotted on the Argand diagram.
Step 2
From your diagram, is it possible to say that |z₁| > |z₂| ?
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Answer
Answer: Yes.
Reason: The distance from the origin to z₁ is greater than the distance from the origin to z₂.
Step 3
Verify algebraically that |z₁| > |z₂|.
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