Comprehension

Direction : Consider the following for the items that follow :

Let f(x) = |x|2 - |x2|

What is f(0.999) + f(1.001) equal to

This question was previously asked in
NDA-II 2024 (Maths) Official Paper (Held On: 01 Sept, 2024)
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  1. -1
  2. 0
  3. 1
  4. 2

Answer (Detailed Solution Below)

Option 2 : 0
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NDA 01/2025: English Subject Test
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Detailed Solution

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Explanation:

f(x) = [x]2 – [x2]

⇒ f(0.999) = [0.999]2 – [0.9992 ]

= = 0 – [value lies b/w 0 and 1]

= 0 – 0 = 0

⇒ f(1.001) = [1.001]2 – [(1.001)2 ]

= 1 – 1 = 0

⇒ f(0.999) + f(1.001) = 0 – 0 = 0

∴ Option (b) is correct.

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