Determine whether the function f(x) is continuous at x=−2.f(x)={9−5x2,−5+3x,amp;x≤−2amp;xgt;−2f(x) is discontinuous at x=−2f(x) is continuous at x=−2
Q. Determine whether the function f(x) is continuous at x=−2.f(x)={9−5x2,−5+3x,x≤−2x>−2f(x) is discontinuous at x=−2f(x) is continuous 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 from the left is equal to the limit of f(x) as x approaches −2 from the right.3. The limit of f(x) as x approaches −2 is equal to the function value at x=−2.
Find Left Limit: First, let's check if the function is defined at x=−2. We look at the piece of the function that applies when x≤−2, which is f(x)=9−5x2. Plugging in x=−2, we get f(−2)=9−5(−2)2=9−5(4)=9−20=−11. So, the function is defined at x=−2.
Find Right Limit: Next, we need to find the limit of f(x) as x approaches −2 from the left. Since the function for x≤−2 is f(x)=9−5x2, the limit as x approaches −2 from the left is the same as the function value at x=−2, which we already calculated as −11.
Verify Continuity: Now, we need to find the limit of f(x) as x approaches −2 from the right. For x > -2, the function is f(x)=−5+3x. Plugging in x=−2, we get the limit as x approaches −2 from the right to be −5+3(−2)=−5−6=−11.
Verify Continuity: Now, we need to find the limit of f(x) as x approaches −2 from the right. For x > -2, the function is f(x)=−5+3x. Plugging in x=−2, we get the limit as x approaches −2 from the right to be −5+3(−2)=−5−6=−11.Since the limit from the left and the limit from the right both equal −11, and the function value at x=−2 is also −11, all three conditions for continuity are satisfied. Therefore, the function f(x) is continuous at x=−2.
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