On the quadratic trinomial of X, if the coefficient of the quadratic term is - 1, the coefficient of the primary term is 2, and the constant term is - 3, then the quadratic trinomial is -______ .

On the quadratic trinomial of X, if the coefficient of the quadratic term is - 1, the coefficient of the primary term is 2, and the constant term is - 3, then the quadratic trinomial is -______ .

∵ on the quadratic trinomial of X, the coefficient of the quadratic term is - 1, the coefficient of the quadratic term is - X2, the coefficient of the primary term is 2, the coefficient of the primary term is 2x, and the constant term is - 3. The quadratic trinomial is: - x2 + 2x-3. So the answer is: - x2 + 2x-3