SAT Math Multiple Choice Question 758: Answer and Explanation

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Test Information

Question: 758

8. If Images, where Images, what is the value of K?

  • A. 22
  • B. -2
  • C. 2 + i
  • D. -2 + i

Correct Answer: A

Explanation:

A

Additional Topics (complex numbers) MEDIUM

Images

Multiply by i:

K + i = i(1 - i)

Distribute:

K + i = i - 2i2

Substitute i2 = -1:

K + i = i + 2

Subtract i:

K = 2

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