Find the value of m such that the function f(x) = { x^2 + m, x < 1; mx + 1, x

Practice Questions

Q1
Find the value of m such that the function f(x) = { x^2 + m, x < 1; mx + 1, x >= 1 is continuous at x = 1.
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Questions & Step-by-Step Solutions

Find the value of m such that the function f(x) = { x^2 + m, x < 1; mx + 1, x >= 1 is continuous at x = 1.
  • Step 1: Understand that we need to find the value of m so that the function f(x) is continuous at x = 1.
  • Step 2: Recall that for a function to be continuous at a point, the left-hand limit and the right-hand limit at that point must be equal to the function's value at that point.
  • Step 3: Identify the two parts of the function: f(x) = x^2 + m for x < 1 and f(x) = mx + 1 for x >= 1.
  • Step 4: Calculate the left-hand limit as x approaches 1 from the left (x < 1): f(1) = 1^2 + m = 1 + m.
  • Step 5: Calculate the right-hand limit as x approaches 1 from the right (x >= 1): f(1) = m(1) + 1 = m + 1.
  • Step 6: Set the left-hand limit equal to the right-hand limit: 1 + m = m + 1.
  • Step 7: Simplify the equation: 1 + m = m + 1 is always true, so we need to find a specific value for m.
  • Step 8: To ensure continuity, we can choose m = 1, which satisfies the equation.
  • Step 9: Therefore, the value of m that makes the function continuous at x = 1 is m = 1.
  • Continuity of Piecewise Functions – The question tests the understanding of how to ensure continuity at a point for piecewise functions by equating the two pieces at that point.
  • Solving for Variables – The question requires solving for the variable m by setting the two expressions equal at the point of interest (x = 1).
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