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

f(x)={[1-x^(2)",",x >= -2],[-9-3x",",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)={1x2,amp;x293x,amp;xlt;2 f(x)=\left\{\begin{array}{ll} 1-x^{2}, &amp; x \geq-2 \\ -9-3 x, &amp; x&lt;-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)={1x2,x293x,x<2 f(x)=\left\{\begin{array}{ll} 1-x^{2}, & x \geq-2 \\ -9-3 x, & x<-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 three conditions:\newline11. The function is defined at x=2x=-2.\newline22. The limit of f(x)f(x) as xx approaches 2-2 from the left is equal to the limit of f(x)f(x) as xx approaches 2-2 from the right.\newline33. The limit of f(x)f(x) as xx approaches 2-2 is equal to the function value at x=2x=-2.\newlineFirst, let's check if the function is defined at x=2x=-2.
  2. Evaluate f(2)f(-2): The function f(x)f(x) is defined piecewise, with one expression for x2x \geq -2 and another for x < -2. At x=2x=-2, the function is defined by the first expression, which is f(x)=1x2f(x) = 1 - x^2.\newlineLet's evaluate f(2)f(-2) using the first expression:\newlinef(2)=1(2)2f(-2) = 1 - (-2)^2\newlinef(2)=14f(-2) = 1 - 4\newlinef(2)=3f(-2) = -3\newlineThe function is defined at x=2x=-2 and f(2)=3f(-2) = -3.
  3. Find Left-hand Limit: Next, we need to find the limit of f(x)f(x) as xx approaches 2-2 from the left, which means we use the expression for x < -2.\newlineThe expression for x < -2 is f(x)=93xf(x) = -9 - 3x. Let's find the limit as xx approaches 2-2 from the left:\newlinelimx2f(x)=93(2)\lim_{x \to -2^-} f(x) = -9 - 3(-2)\newlinelimx2f(x)=9+6\lim_{x \to -2^-} f(x) = -9 + 6\newlinexx00\newlineThe left-hand limit as xx approaches 2-2 is xx33.
  4. Find Right-hand Limit: Now, we need to find the limit of f(x)f(x) as xx approaches 2-2 from the right, which means we use the expression for x2x \geq -2.\newlineThe expression for x2x \geq -2 is f(x)=1x2f(x) = 1 - x^2. Let's find the limit as xx approaches 2-2 from the right:\newlinelimx2+f(x)=1(2)2\lim_{x \to -2^+} f(x) = 1 - (-2)^2\newlinelimx2+f(x)=14\lim_{x \to -2^+} f(x) = 1 - 4\newlinexx00\newlineThe right-hand limit as xx approaches 2-2 is also xx33.
  5. Verify Continuity: Since the left-hand limit and the right-hand limit as xx approaches 2-2 are both equal to 3-3, and the function value at x=2x=-2 is also 3-3, all three conditions for continuity are satisfied.\newlineTherefore, the function f(x)f(x) is continuous at x=2x=-2.

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