Q. Determine whether the function f(x) is continuous at x=2.f(x)={2−x2,−8+3x,x<2x≥2f(x) is continuous at x=2f(x) is discontinuous at x=2
Check Function Definition: To determine if the function f(x) is continuous at x=2, we need to check three conditions:1. The function is defined at x=2.2. The limit of f(x) as x approaches 2 exists.3. The limit of f(x) as x approaches 2 is equal to the function value at x=2.
Find Left Limit: First, let's check if the function is defined at x=2. We look at the piece of the function that applies when x is greater than or equal to 2, which is f(x)=−8+3x. We substitute x with 2 to find f(2).f(2)=−8+3(2)=−8+6=−2.The function is defined at x=2 because f(2)=−2.
Find Right Limit: Next, we need to find the limit of f(x) as x approaches 2 from the left side (x < 2). We use the piece of the function that applies when x is less than 2, which is f(x)=2−x2. We substitute x with a value that is very close to 2 from the left, such as 1.999.x0However, we need to consider the exact value as x approaches 2, not an approximation.x3
Verify Continuity: Now, we need to find the limit of f(x) as x approaches 2 from the right side (x≥2). We use the piece of the function that applies when x is greater than or equal to 2, which is f(x)=−8+3x. We substitute x with a value that is very close to 2 from the right, such as 2.001.x0. Again, we need to consider the exact value as x approaches 2, not an approximation.x3.
Verify Continuity: Now, we need to find the limit of f(x) as x approaches 2 from the right side (x≥2). We use the piece of the function that applies when x is greater than or equal to 2, which is f(x)=−8+3x. We substitute x with a value that is very close to 2 from the right, such as 2.001. x0. Again, we need to consider the exact value as x approaches 2, not an approximation. x3.Since the limit from the left side as x approaches 2 is x6 and the limit from the right side as x approaches 2 is also x6, and both of these limits are equal to the function value at 20 (21), all three conditions for continuity are satisfied. Therefore, the function f(x) is continuous at 20.
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