Q. Determine whether the function f(x) is continuous at x=3.f(x)={13−x2,10−2x,x>3x<3f(x) is continuous at x=3f(x) is discontinuous at x=3
Check Function Definition: To determine if the function f(x) is continuous at x=3, we need to check three conditions:1. The function is defined at x=3.2. The limit of f(x) as x approaches 3 from the left (x→3−) is equal to the limit of f(x) as x approaches 3 from the right (x=30).3. The limit of f(x) as x approaches 3 is equal to the function value at x=3.
Calculate Left Limit: First, let's check if the function is defined at x=3. We have two expressions for f(x), one for x > 3 and one for x < 3. To be defined at x=3, we need to have a value for f(3). Since the function is not explicitly defined at x=3, we cannot say it is defined at this point.
Calculate Right Limit: Next, we calculate the limit of f(x) as x approaches 3 from the left (x→3−). This means we use the expression for f(x) when x < 3, which is f(x)=10−2x.Limit as x→3− of f(x) = Limit as x→3− of x0 = x1 = x2 = x3.
Verify Function Value: Now, we calculate the limit of f(x) as x approaches 3 from the right (x→3+). This means we use the expression for f(x) when x > 3, which is f(x)=13−x2.Limit as x→3+ of f(x) = Limit as x→3+ of x0.
Function Continuity: Since the left-hand limit and the right-hand limit as x approaches 3 are both equal to 4, the second condition for continuity is satisfied. However, we still need to verify that the function value at x=3 is also 4 to satisfy the third condition.
Function Continuity: Since the left-hand limit and the right-hand limit as x approaches 3 are both equal to 4, the second condition for continuity is satisfied. However, we still need to verify that the function value at x=3 is also 4 to satisfy the third condition.As we established in the second step, the function is not explicitly defined at x=3, which means we cannot find a function value f(3) to compare with the limits. Therefore, the function is not continuous at x=3 because it fails the third condition for continuity.
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