`P(x) - Q(x) = (x^5 + 7x^4- 9x^3 - 2x^2 - 1/4 x) - (-x^5 + 5x^4 - 2x^3 + 4x^2 - 1/4)`
`P(x) - Q(x) = x^5 + 7x^4 - 9x^3 - 2x^2 - 1/4x + x^5 - 5x^4 + 2x^3 - 4x^2 + 1/4`
`P(x) - Q(x) = (x^5 + x^5) + (7x^4 - 5x^4) - (9x^3 - 2x^3) - (2x^2 + 4x^2) - 1/4 x + 1/4`
`P(x) - Q(x) =2x^5 + 2x^4 - 7x^3 - 6x^2 - 1/4 x + 1/4`