Solve function 'can't find explicit solution'.

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);

Answer 1

[Walter Roberson]

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