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

f(x)={[1-3x^(2)",",x > 2],[-5-3x",",x <= 2]:}

f(x) is discontinuous at 
x=2

f(x) is continuous at 
x=2

Determine whether the function f(x) f(x) is continuous at x=2 x=2 .\newlinef(x)={13x2,amp;xgt;253x,amp;x2 f(x)=\left\{\begin{array}{ll} 1-3 x^{2}, &amp; x&gt;2 \\ -5-3 x, &amp; x \leq 2 \end{array}\right. \newlinef(x) f(x) is discontinuous at x=2 x=2 \newlinef(x) f(x) is continuous 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)={13x2,x>253x,x2 f(x)=\left\{\begin{array}{ll} 1-3 x^{2}, & x>2 \\ -5-3 x, & x \leq 2 \end{array}\right. \newlinef(x) f(x) is discontinuous at x=2 x=2 \newlinef(x) f(x) is continuous 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 if the following three conditions are met:\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 Limit Left: First, let's check if the function is defined at x=2x=2. We have two expressions for f(x)f(x), one for x > 2 and one for x2x \leq 2. Since we are looking at x=2x=2, we will use the expression for x2x \leq 2.\newlinef(2)=53(2)=56=11f(2) = -5 - 3(2) = -5 - 6 = -11.\newlineThe function is defined at x=2x=2.
  3. Find Limit Right: Next, we need to find the limit of f(x)f(x) as xx approaches 22 from the left (x2x \to 2-). For x2x \leq 2, f(x)=53xf(x) = -5 - 3x.limx2f(x)=limx2(53x)=53(2)=11\lim_{x \to 2-} f(x) = \lim_{x \to 2-} (-5 - 3x) = -5 - 3(2) = -11.
  4. Compare Limits: Now, we need to find the limit of f(x)f(x) as xx approaches 22 from the right (x2+x \to 2+). For x > 2, f(x)=13x2f(x) = 1 - 3x^2.\newlinelimx2+f(x)=limx2+(13x2)=13(2)2=13(4)=112=11\lim_{x \to 2+} f(x) = \lim_{x \to 2+} (1 - 3x^2) = 1 - 3(2)^2 = 1 - 3(4) = 1 - 12 = -11.
  5. Verify Continuity: Since the limit from the left and the limit from the right both exist and are equal to each other, the limit of f(x)f(x) as xx approaches 22 exists and is equal to 11-11.
  6. Verify Continuity: Since the limit from the left and the limit from the right both exist and are equal to each other, the limit of f(x)f(x) as xx approaches 22 exists and is equal to 11-11. Finally, we compare the limit of f(x)f(x) as xx approaches 22, which is 11-11, to the function value at x=2x=2, which is also 11-11. Since these two values are equal, the function is continuous at x=2x=2.

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