Give an example of a reduced cubic in the form x' = 3px + 2q with...

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Give an example of a reduced cubic in the form x' = 3px + 2q with three real roots but where q² – p³ < 0 in Va+ Va - p X = so that Cardano's formula contains complex numbers. x3 = ?*x+? Give an example of a reduced cubic in the form x' = 3px + 2q with three real roots but where q² – p³ < 0 in Va+ Va - p X = so that Cardano's formula contains complex numbers. x3 = ?*x+?