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tmagloire1
 one year ago
If y = 3x3 – 2x and dx/dt equals 3, find dy/dt when x = –2. Give only the numerical answer. For example, if dy, dt = 4, type only 4.
tmagloire1
 one year ago
If y = 3x3 – 2x and dx/dt equals 3, find dy/dt when x = –2. Give only the numerical answer. For example, if dy, dt = 4, type only 4.

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tmagloire1
 one year ago
Best ResponseYou've already chosen the best response.0how did you get that

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Sorry, I'm asking you to clarify, what do you mean by "y = 3x3 – 2x" is that 3 multiplied by 3 or is that 3 times x to the power 3?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0no problem, well dy/dt = (dy/dx)*(dx/dt) (chain rule) then dy/dx = 9 x^2  2 we already know dx/dt = 3 therefore dy/dt = 3*(9x^2 2) so dy/dt = 27x^2  6

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0oh and then x = 2 so you get 102 i think

tmagloire1
 one year ago
Best ResponseYou've already chosen the best response.0Okay i had to implicitly differentiate i forgot. Thank you so much!
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