What are the slopes of the two lines? green has two yellow dots.
1 answer:
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Given the center and the radius
of a circle, its equation is
In your case, the center is (-4,0), and the radius is 2. Plug these values into the generic formula and you'll get the equation.
Differentiate the given solution:
Substitute and
into the ODE:
and it's easy to see the left side indeed reduces to 0.