In this problem, y = 1/(x2 + c)
is a one-parameter family of solutions of the first-order DE
y' + 2xy2 = 0.
Find a solution of the first-order IVP consisting of this differential equation and the given initial condition.
y(4) =
1
7
y =

Give the largest interval I over which the solution is defined.
(??, ?)
(3, ?)
(?3, ?)
(0, 3)
(0, ?)