Determine whether the function f(x) is continuous at x=−2.f(x)={12−3x2,−5−x,amp;x≤−2amp;xgt;−2f(x) is continuous at x=−2f(x) is discontinuous at x=−2
Q. Determine whether the function f(x) is continuous at x=−2.f(x)={12−3x2,−5−x,x≤−2x>−2f(x) is continuous at x=−2f(x) is discontinuous at x=−2
Check Conditions: To determine if the function f(x) is continuous at x=−2, we need to check if the following three conditions are met:1. f(−2) is defined.2. The limit of f(x) as x approaches −2 from the left side (limx→−2−f(x)) exists.3. The limit of f(x) as x approaches −2 from the right side (x=−20) exists and is equal to the limit from the left side and to f(−2).First, we will find f(−2) using the piece of the function defined for x=−23.
Find f(−2): Substitute x=−2 into the first piece of the function, which is 12−3x2, to find f(−2). f(−2)=12−3(−2)2 f(−2)=12−3(4) f(−2)=12−12 f(−2)=0 So, f(−2) is defined and equals 0.
Left Side Limit: Next, we need to find the limit of f(x) as x approaches −2 from the left side. Since the function for x≤−2 is 12−3x2, we use this expression to find the limit.limx→−2−f(x)=limx→−2−(12−3x2)limx→−2−f(x)=12−3(−2)2limx→−2−f(x)=12−12limx→−2−f(x)=0The limit from the left side exists and equals 0.
Right Side Limit: Now, we need to find the limit of f(x) as x approaches −2 from the right side. Since the function for x > -2 is −5−x, we use this expression to find the limit.limx→−2+f(x)=limx→−2+(−5−x)limx→−2+f(x)=−5−(−2)limx→−2+f(x)=−5+2limx→−2+f(x)=−3The limit from the right side exists and equals −3.
Function Continuity: Since the limit from the left side (0) is not equal to the limit from the right side (−3), the function f(x) is not continuous at x=−2. For a function to be continuous at a point, the limit from the left must equal the limit from the right and also equal the function value at that point. In this case, the limits do not match.