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3 votes
The following function is continuous at all points in the domain of real numbers. What is the value of n?

f(x)= 2x+2, if x > n
4x, if x
\leq n
A. -1
B. 0
C. 1/2
D.1

User Pterandon
by
7.6k points

2 Answers

1 vote

Answer:

1. A, -1

2. D, 1

3. B, It is discontinuous because there is a value a for which f(a) is not defined 4. D, It is discontinuous because there is a value a such that lim f(x) does not exist

User Selvin
by
7.7k points
3 votes

Answer:

D. 1

Explanation:

To solve this problem, we just need to find the common point of these linear function, beacuse they form a piecewise function which is continuous according to the problem, that means they are related by one common point.

Let's solve the following expression
f(x)=g(x), where
f(x) =2x+2 and
g(x)=4x. So,


2x+2=4x\\2=4x-2x\\2x=2\\x=1

Which means
n=1, that is, if the n is greater than 1, then the function is defined by
f(x), if the n is least or equal than 1, then the functioni is defined by
g(x)

Therefore, the right answer is D.

User Arnavion
by
7.0k points
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