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

f(x)={[6+3x^(2)",",x >= 2],[20-2x",",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)={6+3x2,amp;x2202x,amp;xlt;2 f(x)=\left\{\begin{array}{ll} 6+3 x^{2}, &amp; x \geq 2 \\ 20-2 x, &amp; x&lt;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)={6+3x2,x2202x,x<2 f(x)=\left\{\begin{array}{ll} 6+3 x^{2}, & x \geq 2 \\ 20-2 x, & x<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.\newlineLet's start by checking if the function is defined at x=2x=2.
  2. Evaluate f(2)f(2): We have two expressions for f(x)f(x), one for x2x \geq 2 and one for x < 2. Since we are checking continuity at x=2x=2, we need to evaluate the function at x=2x=2 using the expression for x2x \geq 2.
    f(2)=6+3(2)2f(2) = 6 + 3(2)^2
    f(2)=6+3(4)f(2) = 6 + 3(4)
    f(2)=6+12f(2) = 6 + 12
    f(x)f(x)00
    The function is defined at x=2x=2 and f(x)f(x)00.
  3. Find Left 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 expression for f(x)f(x) when x < 2.\newlinelimx2f(x)=limx2(202x)\lim_{x \to 2^-} f(x) = \lim_{x \to 2^-} (20 - 2x)\newlinelimx2f(x)=202(2)\lim_{x \to 2^-} f(x) = 20 - 2(2)\newlinelimx2f(x)=204\lim_{x \to 2^-} f(x) = 20 - 4\newlinelimx2f(x)=16\lim_{x \to 2^-} f(x) = 16\newlineThe limit of f(x)f(x) as xx approaches 22 from the left is xx33.
  4. Find Right Limit: 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 expression for f(x)f(x) when x2x \geq 2.\newlinelimx2+f(x)=limx2+(6+3x2)\lim_{x \to 2+} f(x) = \lim_{x \to 2+} (6 + 3x^2)\newlinelimx2+f(x)=6+3(2)2\lim_{x \to 2+} f(x) = 6 + 3(2)^2\newlinelimx2+f(x)=6+3(4)\lim_{x \to 2+} f(x) = 6 + 3(4)\newlinelimx2+f(x)=6+12\lim_{x \to 2+} f(x) = 6 + 12\newlinexx00\newlineThe limit of f(x)f(x) as xx approaches 22 from the right is xx44.
  5. Determine Continuity: We have found that the limit from the left is 1616 and the limit from the right is 1818. Since these two limits are not equal, the limit of f(x)f(x) as xx approaches 22 does not exist. Therefore, the function is not continuous at x=2x=2.

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