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 one year ago
mathcalculus
HELP: Determine the values of where the tangent line is horizontal for the function:
 one year ago
mathcalculus HELP: Determine the values of where the tangent line is horizontal for the function:

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mathcalculus
 one year ago
Best ResponseYou've already chosen the best response.0i know i have to find the derivative and set it to zero but it's not coming out to be correct. can anyone help me

mathcalculus
 one year ago
Best ResponseYou've already chosen the best response.0so i did 3x^26x4=0

mathcalculus
 one year ago
Best ResponseYou've already chosen the best response.0i tried to use the quadratic formula and got sqrt(21)+3/3

mathcalculus
 one year ago
Best ResponseYou've already chosen the best response.0+ or  sqrt(21)+3/3

mathcalculus
 one year ago
Best ResponseYou've already chosen the best response.0also aka 2.52753...

dumbcow
 one year ago
Best ResponseYou've already chosen the best response.1derivative seems correct

mathcalculus
 one year ago
Best ResponseYou've already chosen the best response.0to find what x = to... ?

mathcalculus
 one year ago
Best ResponseYou've already chosen the best response.0i used quadratic formula

mathcalculus
 one year ago
Best ResponseYou've already chosen the best response.0@dumbcow dont i have to do that to find x??

mathcalculus
 one year ago
Best ResponseYou've already chosen the best response.0im getting it wrong,

dumbcow
 one year ago
Best ResponseYou've already chosen the best response.1yes everything looks correct to me...do they want exact or decimal answer?

mathcalculus
 one year ago
Best ResponseYou've already chosen the best response.0can i use quadratic formula for ths one?

mathcalculus
 one year ago
Best ResponseYou've already chosen the best response.0????????????????????????

dumbcow
 one year ago
Best ResponseYou've already chosen the best response.1yes of course you use quadratic formula...thats how you got your answer that i said looked correct

mathcalculus
 one year ago
Best ResponseYou've already chosen the best response.0im not getting that using quadratic formula

mathcalculus
 one year ago
Best ResponseYou've already chosen the best response.0im getting something totally different and wrong

dumbcow
 one year ago
Best ResponseYou've already chosen the best response.1\[x = \frac{3 \pm \sqrt{21}}{3}\]

mathcalculus
 one year ago
Best ResponseYou've already chosen the best response.0yes! but from 6+2*sqrt(21)/6?

mathcalculus
 one year ago
Best ResponseYou've already chosen the best response.0shouldnt it be 1+ or  sqrt 21/3

dumbcow
 one year ago
Best ResponseYou've already chosen the best response.1same thing, just a matter of splitting up fraction or keeping it as single fraction

mathcalculus
 one year ago
Best ResponseYou've already chosen the best response.0no it's not because the answer is 1+ sqrt (7/3) gives me 2.52753 and 1+sqrt 21/3 gives me 1.86086!

dumbcow
 one year ago
Best ResponseYou've already chosen the best response.1hmm \[\frac{\sqrt{7}}{\sqrt{3}} = \frac{\sqrt{21}}{3} \]

mathcalculus
 one year ago
Best ResponseYou've already chosen the best response.0try it on a calculator.

dumbcow
 one year ago
Best ResponseYou've already chosen the best response.1http://www.wolframalpha.com/input/?i=1%2Bsqrt%287%2F3%29+%2C+1%2Bsqrt%2821%29%2F3

dumbcow
 one year ago
Best ResponseYou've already chosen the best response.1oh you added the "1" before dividing by "3"

mathcalculus
 one year ago
Best ResponseYou've already chosen the best response.0okay from my answer.... not the internet.. 6+2 sort(21)/3.... where do i go from there?

dumbcow
 one year ago
Best ResponseYou've already chosen the best response.1well it should be a 6 on bottom

mathcalculus
 one year ago
Best ResponseYou've already chosen the best response.0no i didn't add anything.

mathcalculus
 one year ago
Best ResponseYou've already chosen the best response.0okay sure a 6. i thought it could be a 3 to narrow it down

mathcalculus
 one year ago
Best ResponseYou've already chosen the best response.0so 6+or2sqrt(21)/6

dumbcow
 one year ago
Best ResponseYou've already chosen the best response.1i dont see the problem, you posted answer in beginning... " i tried to use the quadratic formula and got sqrt(21)+3/3 "

mathcalculus
 one year ago
Best ResponseYou've already chosen the best response.0so it is a 3 in the denominator!

dumbcow
 one year ago
Best ResponseYou've already chosen the best response.1\[\frac{6 \pm 2\sqrt{21}}{6} = \frac{2(3 \pm \sqrt{21})}{6} = \frac{3 \pm \sqrt{21}}{3}\]
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