Solve function 'can't find explicit solution'.

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Hunter Hansen
Hunter Hansen 2017-4-12
回答： Walter Roberson 2017-4-13
Hello, I'm trying to solve an equation for values of 'a' and 'b'. I know that the value I assigned 'd' is true for a = 0, b = 7, but I get a warning that Matlab cannot find an explicit solution. Can I get some guidance on how I should address this? Any and all help would be greatly appreciated!
a = sym('a', 'integer');
b = sym('b', 'integer');
d = sym('-21168');
d_eq = d == -16*(4*a^3+27*b^2);
[sola, solb] = solve(d_eq,a,b);

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回答（1 个）

Walter Roberson
Walter Roberson 2017-4-13
MATLAB cannot solve for more variables than there are equations. You have to pick one variable to solve for.
I find solutions for b = +/- 7, +/- 9, and +/- 105

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