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Find y' and the slope of the tangent line to the graph of the equation: 6sq...

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good2beme | Student, Undergraduate | (Level 1) Honors

Posted June 18, 2012 at 5:17 AM via web

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Find y' and the slope of the tangent line to the graph of the equation:

6sq rt.y^+1-2x^3/2-2=0 at the point (4,3)

The sq rt symbol stops at the y^3+1

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thilina-g | College Teacher | (Level 1) Educator

Posted June 18, 2012 at 10:19 AM (Answer #1)

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`6sqrt(y^3+1)-2x^(3/2) - 2 = 0`

Using implicit differentiation,

`6 xx1/2 (y^3+1)^(-1/2) xx 3y^2 xxdy - 2 xx 3/2 xx x^(1/2)dx - 0 = 0`

`(9y^2)/sqrt(y^3+1)xxdy- 3sqrt(x)dx = 0`

`(dy)/(dx) = (3sqrt(x))/((9y^2)/sqrt(y^3+1))`

`(dy)/(dx) = (sqrt(x)sqrt(y^3+1))/(3y^2)`

 

At (4,3),

`(dy)/(dx) = (sqrt(4)sqrt(3^3+1))/(3xx3^2)`

`(dy)/(dx) = (2sqrt(10))/(27)`

 

Therefore the slope of the tangent line to the graph at (4,3) is `(2sqrt(10))/(27)`

 

 

 

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