Sunday, August 3, 2014

Find the critical points and points of inflection of the curve y=x/(2x-3)^2.

At the point of inflection the curvature of the slope
changes sign.


The function we have is y = x/(2x -
3)^2


y' = x'*(2x - 3)^(-2) + x*[(2x -
3)^(-2)]'


=> (2x - 3)^(-2) + x*(-2)(2x -
3)^(-3)*2


=> (2x - 3)^(-2) - 4x*(2x -
3)^(-3)


=> (2x - 3 - 4x)/(2x -
3)^(3)


=> (-2x - 3)/(2x -
3)^(3)


For x = -3/2, y' =
0


When x < -3/2 , y' is positive and when x >
-3/2 y' is negative.


At the crtical point the value of the
derivative is zero or the function cannot be differentiated. This is true for -2x - 3 =
0 or x = -3/2 and at x = 3/2.


The point of
inflection is at x = -3/2. The critical points are at x = -3/2 and x =
3/2.

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