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Determine whether the function 
f(x) is continuous at 
x=2.

f(x)={[2-x^(2)",",x < 2],[-8+3x",",x >= 2]:}

f(x) is continuous at 
x=2

f(x) is discontinuous at 
x=2

Determine whether the function f(x) f(x) is continuous at x=2 x=2 .\newlinef(x)={2x2,amp;xlt;28+3x,amp;x2 f(x)=\left\{\begin{array}{ll} 2-x^{2}, &amp; x&lt;2 \\ -8+3 x, &amp; x \geq 2 \end{array}\right. \newlinef(x) f(x) is continuous at x=2 x=2 \newlinef(x) f(x) is discontinuous at x=2 x=2

Full solution

Q. Determine whether the function f(x) f(x) is continuous at x=2 x=2 .\newlinef(x)={2x2,x<28+3x,x2 f(x)=\left\{\begin{array}{ll} 2-x^{2}, & x<2 \\ -8+3 x, & x \geq 2 \end{array}\right. \newlinef(x) f(x) is continuous at x=2 x=2 \newlinef(x) f(x) is discontinuous at x=2 x=2
  1. Check Function Definition: To determine if the function f(x)f(x) is continuous at x=2x=2, we need to check three conditions:\newline11. The function is defined at x=2x=2.\newline22. The limit of f(x)f(x) as xx approaches 22 exists.\newline33. The limit of f(x)f(x) as xx approaches 22 is equal to the function value at x=2x=2.
  2. Find Left Limit: First, let's check if the function is defined at x=2x=2. We look at the piece of the function that applies when xx is greater than or equal to 22, which is f(x)=8+3xf(x) = -8 + 3x. We substitute xx with 22 to find f(2)f(2).\newlinef(2)=8+3(2)=8+6=2f(2) = -8 + 3(2) = -8 + 6 = -2.\newlineThe function is defined at x=2x=2 because f(2)=2f(2) = -2.
  3. Find Right Limit: Next, we need to find the limit of f(x)f(x) as xx approaches 22 from the left side (x < 2). We use the piece of the function that applies when xx is less than 22, which is f(x)=2x2f(x) = 2 - x^2. We substitute xx with a value that is very close to 22 from the left, such as 1.9991.999.\newlinexx00\newlineHowever, we need to consider the exact value as xx approaches 22, not an approximation.\newlinexx33
  4. Verify Continuity: Now, we need to find the limit of f(x)f(x) as xx approaches 22 from the right side (x2x \geq 2). We use the piece of the function that applies when xx is greater than or equal to 22, which is f(x)=8+3xf(x) = -8 + 3x. We substitute xx with a value that is very close to 22 from the right, such as 2.0012.001.xx00. Again, we need to consider the exact value as xx approaches 22, not an approximation.xx33.
  5. Verify Continuity: Now, we need to find the limit of f(x)f(x) as xx approaches 22 from the right side (x2x \geq 2). We use the piece of the function that applies when xx is greater than or equal to 22, which is f(x)=8+3xf(x) = -8 + 3x. We substitute xx with a value that is very close to 22 from the right, such as 2.0012.001.
    xx00.
    Again, we need to consider the exact value as xx approaches 22, not an approximation.
    xx33.Since the limit from the left side as xx approaches 22 is xx66 and the limit from the right side as xx approaches 22 is also xx66, and both of these limits are equal to the function value at 2200 (2211), all three conditions for continuity are satisfied.
    Therefore, the function f(x)f(x) is continuous at 2200.

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