Q. Determine whether the function f(x) is continuous at x=3.f(x)={4−3x2,−13−3x,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 interested in x=3, we look at the expression for x≤3, which is f(x)=−13−3x.f(3)=−13−3(3)=−13−9=−22.The function is defined at x=3, and f(3)=−22.
Find Right Limit: Next, we need to find the limit of f(x) as x approaches 3 from the left (x→3−). We use the expression for x≤3, which is f(x)=−13−3x.limx→3−f(x)=limx→3−(−13−3x)=−13−3(3)=−13−9=−22.
Determine Continuity: Now, we need to find the limit of f(x) as x approaches 3 from the right (x→3+). We use the expression for x > 3, which is f(x)=4−3x2.limx→3+f(x)=limx→3+(4−3x2)=4−3(3)2=4−3(9)=4−27=−23.
Determine Continuity: Now, we need to find the limit of f(x) as x approaches 3 from the right (x→3+). We use the expression for x > 3, which is f(x)=4−3x2.limx→3+f(x)=limx→3+(4−3x2)=4−3(3)2=4−3(9)=4−27=−23.We have found that the limit from the left is −22 and the limit from the right is −23. 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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