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How would you use implicit differentiation to find an equation of the tangent line to the curve
x^2+ 2xyy^2+x=2 at the point (1,2)
 one year ago
 one year ago
How would you use implicit differentiation to find an equation of the tangent line to the curve x^2+ 2xyy^2+x=2 at the point (1,2)
 one year ago
 one year ago

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myininayaBest ResponseYou've already chosen the best response.1
First step: Take derivative with respect to x on both sides of the equation.
 one year ago

myininayaBest ResponseYou've already chosen the best response.1
\[ (x^2+2xyy^2+x)'=(2)'\]  \[(x^2+2xyy^2+x)'=(x^2)'+(2xy)'(y^2)'+(x)'=....\] \[\text{Here you will need power rule for } (x^2)'\] \[\text{You will need constant multiple rule along with product rule for } (2xy)'\] \[\text{You will need chain rule for } (y^2)'\] \[\text{You will need to know that }(x)'=1 \text{ for the } (x)' \text{part}\]  \[(2)'=....\] You should know the derivative of a constant. :) 
 one year ago

youngbuck2123Best ResponseYou've already chosen the best response.0
i understand the steps i just cannot put 2 and 2 together and get the correct final answer. i got 1/3 as the slope, is the correct?
 one year ago

myininayaBest ResponseYou've already chosen the best response.1
Hmm...Not getting 1/3.... Show me your work so I can see where you messed up. You can do it one line at a time if you want.
 one year ago

myininayaBest ResponseYou've already chosen the best response.1
\[\text{What did you get when you did } (2xy)' \text{ and } (y^2)' ?\]
 one year ago

youngbuck2123Best ResponseYou've already chosen the best response.0
(2xy)' = dy/dx 2y +2x dy/dx and (y^2)' = 2y
 one year ago

myininayaBest ResponseYou've already chosen the best response.1
Looks incorrect for both
 one year ago

myininayaBest ResponseYou've already chosen the best response.1
\[(2xy)' =2(xy)' \text{ By constant multiple rule}\] \[2(xy)'=2[xy]'=2[(x)'y+x(y)'] \text{ By product rule }\]
 one year ago

myininayaBest ResponseYou've already chosen the best response.1
\[(y^n)'=n y ^{n1} y' \text{ By chain rule } \]
 one year ago
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