7
QuizMultiple Choice

Sequences and Iteration

Question 7 • TX-Advanced Quantitative Reasoning

Find the first three iterates of the function f(z) = 2z + (3 - 2i) with an initial value of z0 = 4.

Answer
A
13 + 4i, 28 + 9i, 59 + 20i
B
13 - 4i, 28 - 9i, 59 - 20i
C
11 + 2i, 25 + 6i, 53 + 14i
D
11 - 2i, 25 - 6i, 53 - 14i

Explanation

Apply the function repeatedly, starting with z₀ = 4. First, z₁ = 2(4) + (3 − 2i) = 11 − 2i. Then z₂ = 2(11 − 2i) + (3 − 2i) = 25 − 6i, and z₃ = 2(25 − 6i) + (3 − 2i) = 53 − 14i. The correct choice is D: 11 − 2i, 25 − 6i, 53 − 14i.

AI-written and checked against the verified answer.

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