# DIFFERANTIAL EQUATION! i badly need help

• December 9th 2008, 09:38 PM
kayumanggi
DIFFERANTIAL EQUATION! i badly need help
can any one help me to solve this problem? (Headbang)

Differential Equation of the Circles tangent to x-axis.
• December 9th 2008, 10:28 PM
mr fantastic
Quote:

Originally Posted by kayumanggi
can any one help me to solve this problem? (Headbang)

Differential Equation of the Circles tangent to x-axis.

Circles with the required property have the form $(x - a)^2 + (y - r)^2 = r^2$. So get dy/dx from this equation using implicit differentiation and impose the boundary condition y(0) = r.