Determine whether the function f(x) is continuous at x=2.f(x)={2−x2,−8+3x,amp;xamp;x≥2lt;2f(x) is continuous at x=2Submit Answerf(x) is discontinuous at x=2
Q. Determine whether the function f(x) is continuous at x=2.f(x)={2−x2,−8+3x,x<2x≥2f(x) is continuous at x=2Submit Answerf(x) is discontinuous at x=2
Definition of Continuity: Understand the definition of continuity at a point.A function f(x) is continuous at a point x=a if the following three conditions are met:1. f(a) is defined.2. The limit of f(x) as x approaches a exists.3. The limit of f(x) as x approaches a is equal to f(a).
Check Function Definition: Check if f(2) is defined for the given function.The function f(x) is defined piecewise, so we need to check both pieces to see which one applies at x=2. Since x=2 falls in the second piece of the function, we use the expression for x≥2 to find f(2).f(2)=−8+3(2)=−8+6=−2So, f(2) is defined and equals −2.
Left-hand Limit: Find the limit of f(x) as x approaches 2 from the left.For x < 2, the function is defined as f(x)=2−x2. We need to find the limit as x approaches 2 from the left.limx→2−f(x)=limx→2−(2−x2)=2−(2)2=2−4=−2
Right-hand Limit: Find the limit of f(x) as x approaches 2 from the right.For x≥2, the function is defined as f(x)=−8+3x. We need to find the limit as x approaches 2 from the right.limx→2+f(x)=limx→2+(−8+3x)=−8+3(2)=−8+6=−2
Comparison of Limits: Compare the left-hand limit, right-hand limit, and the value of f(2). We have found that: limx→2−f(x)=−2limx→2+f(x)=−2f(2)=−2 Since all three values are equal, the function f(x) is continuous at x=2.
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