Q. Determine whether the function f(x) is continuous at x=3.f(x)={4−2x2,−11−2x,x>3x≤3f(x) is discontinuous at x=3f(x) is continuous 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 exists.3. The limit of f(x) as x approaches 3 is equal to the function value at x=3.
Find 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. Since we are looking at x=3, we will use the expression for x≤3.f(3)=−11−2(3)=−11−6=−17.The function is defined at x=3.
Find Right Limit: Next, we need to find the limit of f(x) as x approaches 3 from the left (x→3−). For x≤3, f(x)=−11−2x.limx→3−f(x)=limx→3−(−11−2x)=−11−2(3)=−17.
Determine Continuity: Now, we need to find the limit of f(x) as x approaches 3 from the right (x→3+). For x > 3, f(x)=4−2x2.limx→3+f(x)=limx→3+(4−2x2)=4−2(3)2=4−18=−14.
Determine Continuity: Now, we need to find the limit of f(x) as x approaches 3 from the right (x→3+). For x > 3, f(x)=4−2x2.limx→3+f(x)=limx→3+(4−2x2)=4−2(3)2=4−18=−14.We have found that the limit from the left is −17 and the limit from the right is −14. Since these two limits are not equal, the limit of f(x) as x approaches 3 does not exist. Therefore, the function f(x) is not continuous at x3.
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