Q. Determine whether the function f(x) is continuous at x=2.f(x)={6+3x2,20−2x,x≥2x<2f(x) is continuous at x=2f(x) is discontinuous 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 exists.3. The limit of f(x) as x approaches 2 is equal to the function value at x=2.Let's start by checking if the function is defined at x=2.
Evaluate f(2): We have two expressions for f(x), one for x≥2 and one for x < 2. Since we are checking continuity at x=2, we need to evaluate the function at x=2 using the expression for x≥2. f(2)=6+3(2)2 f(2)=6+3(4) f(2)=6+12 f(x)0 The function is defined at x=2 and f(x)0.
Find Left Limit: Next, we need to find the limit of f(x) as x approaches 2 from the left side (x < 2). We use the expression for f(x) when x < 2.limx→2−f(x)=limx→2−(20−2x)limx→2−f(x)=20−2(2)limx→2−f(x)=20−4limx→2−f(x)=16The limit of f(x) as x approaches 2 from the left is x3.
Find Right Limit: Now, we need to find the limit of f(x) as x approaches 2 from the right side (x≥2). We use the expression for f(x) when x≥2.limx→2+f(x)=limx→2+(6+3x2)limx→2+f(x)=6+3(2)2limx→2+f(x)=6+3(4)limx→2+f(x)=6+12x0The limit of f(x) as x approaches 2 from the right is x4.
Determine Continuity: We have found that the limit from the left is 16 and the limit from the right is 18. Since these two limits are not equal, the limit of f(x) as x approaches 2 does not exist. Therefore, the function is not continuous at x=2.
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