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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
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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 \newlineSubmit Answer\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 \newlineSubmit Answer\newlinef(x) f(x) is discontinuous at x=2 x=2
  1. Definition of Continuity: Understand the definition of continuity at a point.\newlineA function f(x)f(x) is continuous at a point x=ax=a if the following three conditions are met:\newline11. f(a)f(a) is defined.\newline22. The limit of f(x)f(x) as xx approaches aa exists.\newline33. The limit of f(x)f(x) as xx approaches aa is equal to f(a)f(a).
  2. Check Function Definition: Check if f(2)f(2) is defined for the given function.\newlineThe function f(x)f(x) is defined piecewise, so we need to check both pieces to see which one applies at x=2x=2. Since x=2x=2 falls in the second piece of the function, we use the expression for x2x \geq 2 to find f(2)f(2).\newlinef(2)=8+3(2)=8+6=2f(2) = -8 + 3(2) = -8 + 6 = -2\newlineSo, f(2)f(2) is defined and equals 2-2.
  3. Left-hand Limit: Find the limit of f(x)f(x) as xx approaches 22 from the left.\newlineFor x < 2, the function is defined as f(x)=2x2f(x) = 2 - x^2. We need to find the limit as xx approaches 22 from the left.\newlinelimx2f(x)=limx2(2x2)=2(2)2=24=2\lim_{x \to 2^-} f(x) = \lim_{x \to 2^-} (2 - x^2) = 2 - (2)^2 = 2 - 4 = -2
  4. Right-hand Limit: Find the limit of f(x)f(x) as xx approaches 22 from the right.\newlineFor x2x \geq 2, the function is defined as f(x)=8+3xf(x) = -8 + 3x. We need to find the limit as xx approaches 22 from the right.\newlinelimx2+f(x)=limx2+(8+3x)=8+3(2)=8+6=2\lim_{x \to 2^+} f(x) = \lim_{x \to 2^+} (-8 + 3x) = -8 + 3(2) = -8 + 6 = -2
  5. Comparison of Limits: Compare the left-hand limit, right-hand limit, and the value of f(2)f(2). We have found that: limx2f(x)=2\lim_{x \to 2^-} f(x) = -2 limx2+f(x)=2\lim_{x \to 2^+} f(x) = -2 f(2)=2f(2) = -2 Since all three values are equal, the function f(x)f(x) is continuous at x=2x=2.

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