Consider the function below.C(x)=x^{\frac{1}{5}}(x+6) (a) Find the

Haven

Haven

Answered question

2021-10-17

Consider the function below.
C(x)=x15(x+6)
(a) Find the interval of increase. (Enter your answer using interval notation.)
Find the interval of decrease. (Enter your answer using interval notation.)
b) Find the local minimum value(s). (Enter your answers as a comma-separated list. If an answer does not exist, enter DNE.)
Find the local maximum value(s). (Enter your answers as a comma-separated list. If an answer does not exist, enter DNE.)
(c) Find the inflection points.
(x, y)=(?) (smaller x-value)
(x, y)=(?) (large x-value)
Find the intervals where the graph is concave upward. (Enter your answer using interval notation.)
Find the interval where the graph is concave downward. (Enter your answer using interval notation.)

Answer & Explanation

Latisha Oneil

Latisha Oneil

Skilled2021-10-18Added 100 answers

Step 1
Consider the function:
f(x)=x15(x+6)
a) (1) f(x)=15π45(x+6)+x15
=x+65x45+x15
=x+6+5x15+455x45
=x+6+5x5x45
=6(x+1)5x45
For the critical points:
f(x)=0
6(x+1)5x45=0
x+1=0 and x0
x=1 and x0
The critical points are x=1 and x=0
Thus, the interval (,1), (1,0), (0, )
In the interval (,1): Take x=2
f(x)=6(2+1)5(2)45=0.68<0
f(x) is decreasing in the interval (,1)
In the interval (1,0): Take x=0.5
f(x)=6(0.5+1)5(0.5)45=1.04>0
f(x) is increasing in the interval (1,0)
In the interval (0,): Take x=1
f(x)=6(1+1)5(1)45=2.4>0

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