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1. If (x-1)^2 =400, which of the following could be the value of x-5?
- A. 15
- B. 15
- C. 15
- D. 15
Answer: Option C
Explanation:
Here, (x - 1)2 = 400
or, x - 1 = ±√400 = ±20
or, x = 1 ± 20
Then, x - 5 = 1 ± 20 - 5 = - 24, 16
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