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grigory [225]
3 years ago
9

Solve the boundary value problem

Mathematics
1 answer:
barxatty [35]3 years ago
3 0
Another Cauchy-Euler ODE. Take y=x^r and you get

r(r-1)x^r-16rx^r+64x^r=0
r^2-17r+64=0
\implies r=\dfrac{17}2\pm\dfrac{\sqrt{33}}2

so that the general solution is

y=C_1x^{(17+\sqrt{33})/2}+C_2x^{(17-\sqrt{33})/2}

With the given boundary conditions, you have

y(1)=0\implies 0=C_1+C_2
y(2)=1\implies 1=C_12^{(17+\sqrt{33})/2}+C_22^{(17-\sqrt{33})/2}
\implies C_1=\dfrac{2^{(-17+\sqrt{33})/2}}{2^{\sqrt{33}}-1},C_2=-\dfrac{2^{(-17+\sqrt{33})/2}}{2^{\sqrt{33}}-1}
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