Polynomial (A-4) x ^ 3-x ^ B + X-B is about the quadratic trinomial of X, find the opposite number of the difference between a and B! Be sure to make it clear, I don't know what is quadratic trinomial, make it clear, I read a = 4 from the Internet, why?

Quadratic trinomial
The highest power of X is 2
That is to say, there should be x ^ 2 instead of x ^ 3
So a = 4
b=2
a-b=2
Its opposite number is - 2

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