যদি f(x) = |x + 1| + |x + 10| হয়, তাহলে f(x) এর সর্বনিম্ন মান নির্ণয় করুন।

  1. 10
  2. 1
  3. 9
  4. 21

Answer (Detailed Solution Below)

Option 3 : 9
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Detailed Solution

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গণনা:

f(x) = |x + 1| + |x + 10|

|x + 1| = 0 তাহলে x = -1

|x + 10| = 0 তাহলে x = -10

f(x) শূন্য হতে পারে যখন x = -1 বা x = -10

f(-1) = |-1 + 1| + |-1 + 10| =9

f(-10) = |-10 + 1| + |-10 + 10| =9

∴ f(x) এর ন্যূনতম মান = 9 এ x = -1 বা x = -10

Important Points

যদি f(x) = |x + a| + |x + b| হয়, তাহলে

|x + a| এবং |x + b| = 0

তারা পৃথকভাবে শূন্য হতে পারে কিন্তু একই সময়ে শূন্য হতে পারে না।

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