Question
Determine the absolute extrema of the function 𝑓(𝑥)=𝑥3−18𝑥2 96𝑥 , on the interval [1,10]
201
likes1005 views
Answer to a math question Determine the absolute extrema of the function 𝑓(𝑥)=𝑥3−18𝑥2 96𝑥 , on the interval [1,10]
Seamus
4.999 Answers
Answer:
absolute minimum is at f(10) = -704
absolute maximum is at f(1) = 79
Solution:
f(x) = x³ - 18x² + 96x
f'(x) = 3x² - 36x + 96
then solve for x where f'(x) = 0
f'(x) = 3x² - 36x + 96
0 = 3x² - 36x + 96
0 = 3(x² - 12x + 32)
0 = x² - 12x + 32
0 = (x - 4)(x - 8)
x = 4
x = 8
Since 4 and 8 is in the interval [1,10] we can solve for f(x) using 1,4,8, and 10
f(x) = x³ - 18x² + 96x
f(1) = 1³ - 18(1)² + 96(1) = 79
f(4) = 4³ - 18(4)² + 96(4) = -128
f(8) = 8³ - 18(8)² + 96(8) = -544
f(10) = 10³ - 18(10)² + 96(10) = -704
making the value at f(10) the absolute minimum and the value at f(1) the absolute maximum
Frequently asked questions (FAQs)
Find the 3rd order derivative of the function f(x) = 2x³ + 5x² + 3x - 4.
+
Question: What is the standard deviation of the following dataset: [8, 12, 16, 20, 24]?
+
What is the value of sine of π/6 on the unit circle?
+
New questions in Mathematics