How to solve a differential equation and the plug a number in for the resulting differential equation

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Benjamin Cai
Benjamin Cai 2020-2-13
回答： David Goodmanson 2020-2-14
I can do diff((1 + 5 * x^2 - 2 * x^3 + 8 * x^4) ^(1/8))), but I don't have an idea what to after

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回答（1 个）

David Goodmanson
David Goodmanson 2020-2-14
Hi Benjamin,
syms x
d = diff((1 + 5 * x^2 - 2 * x^3 + 8 * x^4) ^(1/8))
x0 = 8.8
val = double(subs(d,x0))
val =
0.2187
% this shows part of what is going on
dx0 = subs(d,x0)

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