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Which of the following functions are continuous for all real numbers?

g(x)=2^(x)

f(x)=ln(x)
Choose 1 answer:
(A) 
g only
(B) 
f only
(C) Both 
g and 
f
(D) Neither 
g nor 
f

Which of the following functions are continuous for all real numbers?\newlineg(x)=2x g(x)=2^{x} \newlinef(x)=ln(x) f(x)=\ln (x) \newlineChoose 11 answer:\newline(A) g g only\newline(B) f f only\newline(C) Both g g and f f \newline(D) Neither g g nor f f

Full solution

Q. Which of the following functions are continuous for all real numbers?\newlineg(x)=2x g(x)=2^{x} \newlinef(x)=ln(x) f(x)=\ln (x) \newlineChoose 11 answer:\newline(A) g g only\newline(B) f f only\newline(C) Both g g and f f \newline(D) Neither g g nor f f
  1. Analyze g(x)=2xg(x) = 2^x: Analyze the function g(x)=2xg(x) = 2^x. The function g(x)=2xg(x) = 2^x is an exponential function with a base greater than 11. Exponential functions are continuous for all real numbers because there are no breaks, jumps, or holes in the graph of an exponential function.
  2. Analyze f(x)=ln(x)f(x) = \ln(x): Analyze the function f(x)=ln(x)f(x) = \ln(x). The function f(x)=ln(x)f(x) = \ln(x) is the natural logarithm function. The domain of the natural logarithm function is (0,)(0, \infty), which means it is only defined for positive real numbers. Therefore, f(x)f(x) is not continuous for all real numbers because it is not defined for x0x \leq 0.
  3. Determine continuity: Determine which functions are continuous for all real numbers.\newlineBased on the analysis, g(x)=2xg(x) = 2^x is continuous for all real numbers, while f(x)=ln(x)f(x) = \ln(x) is not. Therefore, the correct choice is that only g(x)g(x) is continuous for all real numbers.

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