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A day full of math games & activities. Find one near you.
A day full of math games & activities. Find one near you.
A day full of math games & activities. Find one near you.
Find an explicit solution of the given initial-value problem. x2(dy/dx) = y - xy, y(-1) = -1
Solution:
Given: Differential equation is x2(dy/dx) = y - xy, y(-1) = -1
Rearrange the terms in terms of dy/dx
dy/dx = y(1 - x)/x2
(1/y)dy/dx = (1 - x)/x2
(1/y)dy = (1 - x)/ x2dx
Integrate on both sides, we get
∫(1/y)dy = ∫(1 - x)/x2dx
ln|y| + c = -ln|x| - 1/x
-1/x - ln|x| = ln|y| + c --- (a)
Given: When x = -1, y = -1, substitute in eq(a)
-1/-1 - ln|-1| = ln|-1| +c
1 - 0 = 0 + c
c = 1
The solution is ln|y| = -1/x - ln|x| - 1
Find an explicit solution of the given initial-value problem. x2(dy/dx) = y - xy, y(-1) = -1
Summary:
The explicit solution of the given initial-value problem. x2(dy/dx) = y - xy, y(-1) = -1 is ln|y| = -1/x - ln|x| - 1.
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