1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
erica [24]
3 years ago
10

Determine where the function is increasing and where it is decreasing. (Enter your answers using interval notation. If an answer

does not exist, enter DNE.)
f(t) = (t3 + 3t2)3
increasing    

decreasing    
Mathematics
1 answer:
tankabanditka [31]3 years ago
3 0
<span>The function can only change from increasing to decreasing, and visa-versa at those points where the slope of the function is 0. And the slope of the function is determined by the first derivative of the function. So let's calculate the first derivative. f(t) = (t^3 + 3t^2)^3 f'(t) = d/dt[ (t^3 + 3t^2)^3 ] f'(t) = 3(t^3 + 3t^2)^2 * d/dt[ t^3 + 3t^2 ] f'(t) = 3(d/dt[ t^3 ] + 3 * d/dt[ t^2 ])(t^3 + 3t^2)^2 f'(t) = 3(3t^2 + 3 * 2t)(t^3 + 3t^2)^2 f'(t) = 3(3t^2 + 6t)(t^3 + 3t^2)^2 Simplify f'(t) = 3(3t^2 + 6t)(t^3 + 3t^2)^2 f'(t) = 3 * 3t(t + 2)(t^3 + 3t^2)^2 f'(t) = 9t(t + 2)(t^2(t + 3))^2 f'(t) = 9t(t + 2)t^4(t + 3)^2 f'(t) = 9t^5(t + 2)(t + 3)^2 And looking at the function, it becomes obvious that the roots (or inflection points) are at t = 0, t = -2, and t = -3. Now the only places where f(t) can switch directions is at those 3 inflection points. And at exactly those inflection points the curve is neither increasing, nor decreasing. If the slope of the function is positive, then its value is increasing, and if the slope is negative, then the function is decreasing. So all we need to do is calculate the value of the first derivative for any value between each inflection point plus one value smaller than the smallest inflection point and another value higher than the highest inflection point. Range from [-infinity, -3) f'(-4) = 18432 Since the value is positive, the function is increasing from [-infinity, -3) Range from (-3, -2) f'(-2.5) = 30.51758 Since the value is positive, the function is increasing from (-3, -2) Range from (-2, 0) f(-1) = -36 Since the value is negative, the function is decreasing from (-2, 0) Range from (0, infinity) f(1) = 64 Since the value is positive, the function is increasing from (0, +infinity) To summarize: increasing from [-infinity, -3) increasing from (-3,-2) decreasing from (-2,0) increasing from (0,infinity]</span>
You might be interested in
Plz help me. I'll give Brainliest.
-BARSIC- [3]

Answer:

I can't see the work ?????!!!

8 0
3 years ago
What is this expression in simplified form? <br>​
Sphinxa [80]
The expression simplified in form is answer : A
7 0
3 years ago
Answer all of them and i will give brainlist i thought they were to hard
earnstyle [38]

Answer:

thought they were to hard

get them correct il give brainlist

5 0
2 years ago
Find the slope between the two points given. Then, use the slope and the first point to write the equation of the line in Point-
Vera_Pavlovna [14]
M(slope)= -5/4 point-slope(y-y1=m(x-x1)) so it would be y-5= -5/4(x+4)
3 0
2 years ago
Read 2 more answers
Select all the expressions which are equivalent to<br> -4/3p - 2/5
AVprozaik [17]

Answer

-2/5 -4/3 p and -4/3p+ (-2/5)

Step-by-step explanation:

those two are the only answers that has both parts of the expressions as negative.

6 0
3 years ago
Other questions:
  • PLEASE HELPPP Which shows the graph of the solution y is less than or equal to -4x + 3
    15·1 answer
  • Find the equation of the exponential function represented by the table ​
    8·1 answer
  • Twice the difference of 9 and a number
    6·1 answer
  • What is the value of x if 5^x+2=5^9?
    9·1 answer
  • Probability:
    9·1 answer
  • What is the mean and median of this data set
    9·1 answer
  • Could someone help me with this?​
    12·2 answers
  • A map has a scale of 2 cm equals 30 miles. If two towns are 300 miles apart, how far are they away from each other on the map?
    14·2 answers
  • PLSSS HELPPPP I WILLL GIVE YOU BRAINLIEST!!!!!! PLSSS HELPPPP I WILLL GIVE YOU BRAINLIEST!!!!!! PLSSS HELPPPP I WILLL GIVE YOU B
    11·2 answers
  • What is the slope of y = -4?
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!