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Determine the continuity of the function fx=x3-x

Question

Determine the continuity of the function fx=x3-x

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Solution

To determine the continuity of the function f(x) = x^3 - x, we need to check three conditions:

  1. The function is defined for all real numbers. In this case, the function f(x) = x^3 - x is a polynomial, and polynomials are defined for all real numbers.

  2. The limit of the function as x approaches a certain value from the left (denoted as x->a-) is equal to the limit of the function as x approaches that value from the right (denoted as x->a+). For all real numbers a, the limit as x approaches a from the left and right for the function f(x) = x^3 - x is the same, because the function is a polynomial and polynomials are continuous everywhere.

  3. The limit of the function as x approaches a certain value is equal to the value of the function at that point. For all real numbers a, the limit as x approaches a for the function f(x) = x^3 - x is equal to f(a), because the function is a polynomial and polynomials are continuous everywhere.

Therefore, the function f(x) = x^3 - x is continuous for all real numbers.

This problem has been solved

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Determine the value of ‘k’ for which the following function is continuous at x = 3: (All India 2017)

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