Q. Determine whether the function f(x) is continuous at x=6.f(x)={16−x2,−2−3x,x<6x≥6f(x) is discontinuous at x=6f(x) is continuous at x=6
Check Function Definition: To determine if the function f(x) is continuous at x=6, we need to check three conditions: 1. The function is defined at x=6.2. The limit of f(x) as x approaches 6 exists.3. The limit of f(x) as x approaches 6 is equal to the function value at x=6.Let's start by checking if the function is defined at x=6.
Evaluate f(6): The function f(x) is defined piecewise, with one expression for x < 6 and another for x≥6. At x=6, the function is defined by the second piece, f(x)=−2−3x. Let's evaluate f(6).f(6)=−2−3(6)=−2−18=−20.So, the function is defined at x=6 and f(6)=−20.
Calculate Left Limit: Next, we need to find the limit of f(x) as x approaches 6 from the left, which is denoted as limx→6−f(x). For x < 6, f(x)=16−x2. Let's calculate the limit.limx→6−f(x)=limx→6−(16−x2)=16−(6)2=16−36=−20.
Calculate Right Limit: Now, we need to find the limit of f(x) as x approaches 6 from the right, which is denoted as limx→6+f(x). For x≥6, f(x)=−2−3x. Let's calculate the limit.limx→6+f(x)=limx→6+(−2−3x)=−2−3(6)=−2−18=−20.
Check Limit Existence: Since the limit from the left and the limit from the right both exist and are equal to each other, the limit of f(x) as x approaches 6 exists and is equal to −20.
Compare Limit and Function Value: Finally, we compare the limit of f(x) as x approaches 6 to the function value at x=6. Since both the limit and the function value at x=6 are equal to −20, the function f(x) is continuous at x=6.