Determine whether the function f(x) is continuous at x=−2.f(x)={1−x2,−9−3x,amp;x≥−2amp;xlt;−2f(x) is discontinuous at x=−2f(x) is continuous at x=−2
Q. Determine whether the function f(x) is continuous at x=−2.f(x)={1−x2,−9−3x,x≥−2x<−2f(x) is discontinuous at x=−2f(x) is continuous 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 from the left is equal to the limit of f(x) as x approaches −2 from the right.3. The limit of f(x) as x approaches −2 is equal to the function value at x=−2.First, let's check if the function is defined at x=−2.
Evaluate f(−2): The function f(x) is defined piecewise, with one expression for x≥−2 and another for x < -2. At x=−2, the function is defined by the first expression, which is f(x)=1−x2.Let's evaluate f(−2) using the first expression:f(−2)=1−(−2)2f(−2)=1−4f(−2)=−3The function is defined at x=−2 and f(−2)=−3.
Find Left-hand Limit: Next, we need to find the limit of f(x) as x approaches −2 from the left, which means we use the expression for x < -2.The expression for x < -2 is f(x)=−9−3x. Let's find the limit as x approaches −2 from the left:limx→−2−f(x)=−9−3(−2)limx→−2−f(x)=−9+6x0The left-hand limit as x approaches −2 is x3.
Find Right-hand Limit: Now, we need to find the limit of f(x) as x approaches −2 from the right, which means we use the expression for x≥−2.The expression for x≥−2 is f(x)=1−x2. Let's find the limit as x approaches −2 from the right:limx→−2+f(x)=1−(−2)2limx→−2+f(x)=1−4x0The right-hand limit as x approaches −2 is also x3.
Verify Continuity: Since the left-hand limit and the right-hand limit as x approaches −2 are both equal to −3, and the function value at x=−2 is also −3, all three conditions for continuity are satisfied.Therefore, the function f(x) is continuous at x=−2.
More problems from Find derivatives of sine and cosine functions