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July 22, 2014

July 22, 2014

Posted by **beauty** on Tuesday, October 9, 2012 at 8:48pm.

f(x)=x^2/x+4 ; (3,9/7)

- math -
**Reiny**, Tuesday, October 9, 2012 at 9:44pmf ' (x) = ((x+4)(2x) - 2x(1) )/(x+4)^2

= (2x^2 + 6x)/(x+4)^2

when x = 3

slope = 36/49

so y = (36/49)x + b

at (3,9/7)

9/7 = (36/49)(3) + b

b = 9/7 - 108/49

= -45/49

y = (36/49)x - 45/49 or (36x - 45)/49

check my arithmetic

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