For which value of c is the function f(x) = { 3x + c, x < 1; 2x^2, x >= 1

Practice Questions

Q1
For which value of c is the function f(x) = { 3x + c, x < 1; 2x^2, x >= 1 continuous at x = 1?
  1. -1
  2. 0
  3. 1
  4. 2

Questions & Step-by-Step Solutions

For which value of c is the function f(x) = { 3x + c, x < 1; 2x^2, x >= 1 continuous at x = 1?
  • Step 1: Identify the function f(x) which has two parts: f(x) = 3x + c for x < 1 and f(x) = 2x^2 for x >= 1.
  • Step 2: To find the value of c that makes the function continuous at x = 1, we need to ensure that the two parts of the function meet at that point.
  • Step 3: Calculate the value of f(x) when x = 1 using the first part of the function: f(1) = 3(1) + c.
  • Step 4: Calculate the value of f(x) when x = 1 using the second part of the function: f(1) = 2(1)^2.
  • Step 5: Set the two results equal to each other: 3(1) + c = 2(1)^2.
  • Step 6: Simplify the equation: 3 + c = 2.
  • Step 7: Solve for c by subtracting 3 from both sides: c = 2 - 3.
  • Step 8: Find the value of c: c = -1.
  • Continuity of Piecewise Functions – The question tests the understanding of how to ensure continuity at a point for piecewise functions by equating the limits from both sides.
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