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Let f be a real-valued function of a real variable defined as f ( x) = x 2 for x ≥ 0 , and 2f ( x) =- x2 for x < 0 . Which one of the following statements is true?
  • a)
    f (x) is discontinuous at x = 0 .
  • b)
    f (x) is continuous but not differentiable at x = 0 .
  • c)
    f (x) is differentiable but its first derivative is not continuous at x = 0 .
  • d)
    f (x) is differentiable but its first derivative is not differentiable at x = 0 
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
Let f be a real-valued function of a real variable defined as f ( x) =...
The domain of the function is all real numbers, since any real number can be squared. The range of the function is all non-negative real numbers, since the square of any real number is non-negative. The function is continuous and increasing for all x, since the derivative of f(x) is 2x which is always positive except at x=0 where it is zero. The function is also symmetric about the y-axis, since f(-x) = (-x)^2 = x^2 = f(x).
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Let f be a real-valued function of a real variable defined as f ( x) = x 2 for x ≥ 0 , and 2f ( x) =- x2 for x < 0 . Which one of the following statements is true?a)f (x) is discontinuous at x = 0 .b)f (x) is continuous but not differentiable at x = 0 .c)f (x) is differentiable but its first derivative is not continuous at x = 0 .d)f (x) is differentiable but its first derivative is not differentiable at x = 0Correct answer is option 'D'. Can you explain this answer?
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Let f be a real-valued function of a real variable defined as f ( x) = x 2 for x ≥ 0 , and 2f ( x) =- x2 for x < 0 . Which one of the following statements is true?a)f (x) is discontinuous at x = 0 .b)f (x) is continuous but not differentiable at x = 0 .c)f (x) is differentiable but its first derivative is not continuous at x = 0 .d)f (x) is differentiable but its first derivative is not differentiable at x = 0Correct answer is option 'D'. Can you explain this answer? for GATE 2024 is part of GATE preparation. The Question and answers have been prepared according to the GATE exam syllabus. Information about Let f be a real-valued function of a real variable defined as f ( x) = x 2 for x ≥ 0 , and 2f ( x) =- x2 for x < 0 . Which one of the following statements is true?a)f (x) is discontinuous at x = 0 .b)f (x) is continuous but not differentiable at x = 0 .c)f (x) is differentiable but its first derivative is not continuous at x = 0 .d)f (x) is differentiable but its first derivative is not differentiable at x = 0Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for GATE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Let f be a real-valued function of a real variable defined as f ( x) = x 2 for x ≥ 0 , and 2f ( x) =- x2 for x < 0 . Which one of the following statements is true?a)f (x) is discontinuous at x = 0 .b)f (x) is continuous but not differentiable at x = 0 .c)f (x) is differentiable but its first derivative is not continuous at x = 0 .d)f (x) is differentiable but its first derivative is not differentiable at x = 0Correct answer is option 'D'. Can you explain this answer?.
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