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Like this

sage: x,y,z=polygens(QQ,'x,y,z')
sage: E=EllipticCurve_from_cubic(-y*y*z+(2*x+z)*(3*x+z)*(4*x+z))
sage: E
Scheme morphism:
  From: Projective Plane Curve over Rational Field defined by 24*x^3 + 26*x^2*z - y^2*z + 9*x*z^2 + z^3
  To:   Elliptic Curve defined by y^2 = x^3 + 26*x^2 + 216*x + 576 over Rational Field
  Defn: Defined on coordinates by sending (x : y : z) to
        (-x : -y : -1/24*z)