onegirl
Find all critical numbers by hand. If available, use graphing technology to determine whether the critical number represents a local maximum, local minimum, or neither.
f(x) = x^4 - 3x^3 + 2
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onegirl
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@rajathsbhat can u help?
rajathsbhat
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not too sure about this :\
onegirl
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ok
onegirl
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@electrokid can u help?
tomatooooo
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are you allowed to use calculus for this? or algebra 2?
modphysnoob
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take derivative
onegirl
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okay the derivative is x^2(4x - 9)
onegirl
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or 4x^3 - 9x^2
modphysnoob
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set that equal to 0 and solve for x
onegirl
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okay
onegirl
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i get 0 and 9/4
modphysnoob
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that's your criticle number
onegirl
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okay so thats it?
onegirl
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how do i determine whether it is local maximum, minimum or either
onegirl
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neither*
modphysnoob
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1)Plug in Crit point into F''(t); positive number mean min, negative number mean max
onegirl
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okay thanks