Consider the function f(x) = x + x ∈ . If α is the length of interval of decrease and β be the length of interval of increase, then 3(α + β) is equal to 1/2, 11/2

Archita Gahoi

Archita Gahoi

Answered question

2022-08-31

Consider the function f(x) = x + x. If α is the length of interval of decrease and β be the length of interval of increase, then 3(α + β) is equal to

 

 

Answer & Explanation

nick1337

nick1337

Expert2023-05-29Added 777 answers

To solve the given problem, let's analyze the function:
f(x)=x+12x
The interval in which the function is defined is (1/2,11/2).
To determine the intervals of increase and decrease, we need to find the critical points of the function. The critical points occur where the derivative of the function is equal to zero or does not exist.
Let's find the derivative of f(x):
f(x)=1+12
Setting f(x) equal to zero, we have:
1+12=0
Solving this equation for x, we find that there are no solutions. This means that the derivative is always positive and the function f(x) is always increasing on the interval (1/2,11/2).
Therefore, there is no interval of decrease (α=0) and the entire interval (1/2,11/2) is the interval of increase (β=11/21/2=5).
Now, we can calculate 3(α+β):
3(α+β)=3(0+5)=3·5=15
Therefore, 3(α+β) is equal to 15.

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