Mathematics
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OpenStudy (anonymous):
@DanJS Derivatives
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OpenStudy (danjs):
k
OpenStudy (anonymous):
OpenStudy (anonymous):
which one looks like one with multiple critical points?
OpenStudy (danjs):
which # you want to do
OpenStudy (jhannybean):
Try some of the even numbered ones. They're usually (most of the time) harder.
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OpenStudy (danjs):
x^2(6-x) will have more than 1
OpenStudy (anonymous):
oh no even number ones. im on a time crunch and the hw assignment is on the odd numbers
OpenStudy (anonymous):
okay
OpenStudy (danjs):
25) g(x) = x^2 * (6-x)
OpenStudy (danjs):
First, find the 2 derivatives
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OpenStudy (anonymous):
g'(x) = 12x-2x^2
OpenStudy (anonymous):
right?
OpenStudy (danjs):
g ' (x) = 12x - 3x^2
OpenStudy (anonymous):
wait are you sure?
OpenStudy (jhannybean):
I think whenyou multiplied \(x^2 \cdot (-x)\) you mutliplied it as \(x \cdot (-x)\).
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OpenStudy (jhannybean):
\[g(x) = x^2(6-x)\]\[g(x) = 6x^2 -x^3\]\[g'(x) = 12x - 3x^2 \checkmark\]
OpenStudy (anonymous):
oh okay
OpenStudy (danjs):
solve g ' (x) = 0, for values of x
OpenStudy (anonymous):
x=0 and x= 6
OpenStudy (jhannybean):
This might help you.
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OpenStudy (danjs):
test a number in each of those intervals and see if g '(x) is + or -
OpenStudy (anonymous):
one second
OpenStudy (danjs):
wait a second, i just looked back at things
g ' (x) = 12 x - 3x^2
0 = 12x-3x^2 = 3x ( 4 - x)
x = 4 or x= 0
OpenStudy (danjs):
|dw:1421034999723:dw|
OpenStudy (danjs):
g ' ( -1) = -15 (-) decreasing
g ' ( 1) = (+) increasing
g '( 5) = (-) decreasing
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OpenStudy (danjs):
|dw:1421035115238:dw|