Consider the polynomials given below.
P= x^4 + 3x^3 + 2x^2 - x + 2
Q = (x^3 + 2x^2 + 3)(x^2 - 2)
Determine the operation that results in the simplified expression below.
x^5 + x^4 - 5x^3 - 3x^2 + x - 8