Q. Determine whether the function f(x) is continuous at x=2.f(x)={1−3x2,−5−3x,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 if the following three conditions are met: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 Limit Left: First, let's check if the function is defined at x=2. We have two expressions for f(x), one for x > 2 and one for x≤2. Since we are looking at x=2, we will use the expression for x≤2.f(2)=−5−3(2)=−5−6=−11.The function is defined at x=2.
Find Limit Right: Next, we need to find the limit of f(x) as x approaches 2 from the left (x→2−). For x≤2, f(x)=−5−3x.limx→2−f(x)=limx→2−(−5−3x)=−5−3(2)=−11.
Compare Limits: Now, we need to find the limit of f(x) as x approaches 2 from the right (x→2+). For x > 2, f(x)=1−3x2.limx→2+f(x)=limx→2+(1−3x2)=1−3(2)2=1−3(4)=1−12=−11.
Verify Continuity: 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 2 exists and is equal to −11.
Verify Continuity: 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 2 exists and is equal to −11. Finally, we compare the limit of f(x) as x approaches 2, which is −11, to the function value at x=2, which is also −11. Since these two values are equal, the function is continuous at x=2.
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