Digital PSAT Math Practice Question 162: Answer and Explanation
Question: 162
If 
, what is the value of (3 - i)(4 + i)?
- A. 11 - i
- B. 12 + 7i
- C. 13 - i
- D. 13 + i
Correct Answer: C
Explanation:
(C) Use FOIL for this like you would anything else. When you FOIL the expression, you get:
Because 
. Thus, we can rewrite our equation as:
Therefore, the final answer is 13 - i, which is choice (C).
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