If the coefficient of the quadratic trinomial of X is - 5, write this polynomial

If the coefficient of the quadratic trinomial of X is - 5, write this polynomial

-5x²-5x-5

Write a quadratic trinomial about the letter X (the coefficient of quadratic term is required to be - 1)

-x²+4x+2

Write a quadratic trinomial about X so that the coefficient of its quadratic term is negative 0.5, then what is the quadratic trinomial

According to the concept of quadratic trinomial, the degree of the polynomial is quadratic and the number of terms is three
The answer to this question is not unique. All the quadratic trinomials in the form of - 1 / 2x2 + ax + B (a ≠ 0, B ≠ 0) conform to the meaning of the question
For example: - 1 / 2x2 + X + 1