Writing:
eqn = x^3 + c2 x^2 + c1 x + c0 == 0;
ass = {c2 -> 3, c1 -> 3, c0 -> 3};
sol = Assuming[c1 == c2^2/3, Simplify[Solve[eqn, x]]] /. ass;
eqn /. ass /. sol // FullSimplify
I get:
{False, False, False}
and I can't understand why! Ideas? Thank you!
Assuming
have no effect, because the result ofSolve
does not containc1
orc2
, since you have replaced them with explicit numerical values by doingeqn /. ass
. $\endgroup$ – MarcoB Mar 22 '19 at 18:48