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Mathematics · JEE | APPLICATION OF DERIVATIVES

हिन्दी

Given below two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): The function \( f(x) = x^3 - 3x^2 + 3x - 100 \) is strictly increasing on \( \mathbb{R} \). Reason (R): If \( f'(x) > 0 \) for all \( x \in \mathbb{R} \), then \( f(x) \) is strictly increasing on \( \mathbb{R} \). In the light of the above statements, choose the correct answer from the options given below:

  1. A
    Both (A) and (R) are true and (R) is the correct explanation of (A).
  2. B
    Both (A) and (R) are true but (R) is NOT the correct explanation of (A).
  3. C
    (A) is true but (R) is false.
  4. D
    (A) is false but (R) is true.
View Answer & Solution

Correct answer · Option A

Both (A) and (R) are true and (R) is the correct explanation of (A).

Explanation

Here \( f'(x) = 3x^2 - 6x + 3 = 3(x-1)^2 \ge 0 \). Strictly speaking, since \( f'(x) > 0 \) for \( x \neq 1 \) and zero at \( x=1 \), it is strictly increasing on \( \mathbb{R} \). Both assertion and reason correctly apply.
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