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f(x)=(6x+5)/(2-sqrt(14+5x))
We want to find 
lim_(x rarr-2)f(x).
What happens when we use direct substitution?
Choose 1 answer:
(A) The limit exists, and we found it!
(B) The limit doesn't exist (probably an asymptote).
(C) The result is indeterminate.

f(x)=6x+5214+5x f(x)=\frac{6 x+5}{2-\sqrt{14+5 x}} \newlineWe want to find limx2f(x) \lim _{x \rightarrow-2} f(x) .\newlineWhat happens when we use direct substitution?\newlineChoose 11 answer:\newline(A) The limit exists, and we found it!\newline(B) The limit doesn't exist (probably an asymptote).\newline(C) The result is indeterminate.

Full solution

Q. f(x)=6x+5214+5x f(x)=\frac{6 x+5}{2-\sqrt{14+5 x}} \newlineWe want to find limx2f(x) \lim _{x \rightarrow-2} f(x) .\newlineWhat happens when we use direct substitution?\newlineChoose 11 answer:\newline(A) The limit exists, and we found it!\newline(B) The limit doesn't exist (probably an asymptote).\newline(C) The result is indeterminate.
  1. Substitute xx with 2-2: Substitute xx with 2-2 in the function f(x)f(x) to see if direct substitution is possible.\newlinef(x)=6x+5214+5xf(x) = \frac{6x + 5}{2 - \sqrt{14 + 5x}}\newlinef(2)=6(2)+5214+5(2)f(-2) = \frac{6(-2) + 5}{2 - \sqrt{14 + 5(-2)}}
  2. Perform calculations after substitution: Perform the calculations inside the function after substitution.\newlinef(2)=(12+5)/(21410)f(-2) = (-12 + 5) / (2 - \sqrt{14 - 10})\newlinef(2)=(7)/(24)f(-2) = (-7) / (2 - \sqrt{4})\newlinef(2)=(7)/(22)f(-2) = (-7) / (2 - 2)
  3. Simplify the result of substitution: Simplify the result of the substitution to identify any issues.\newlinef(2)=70f(-2) = \frac{-7}{0}\newlineWe have a division by zero situation, which means the function is undefined at x=2x = -2.
  4. Determine behavior of the limit: Determine the behavior of the limit based on the result of direct substitution.\newlineSince we have a division by 00, the limit does not exist due to a potential vertical asymptote at x=2x = -2.

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