$P\left(x\right)+Q\left(x\right):x^5+10x^4-10x^3+3x^2+x+5$  

 $P\left(x\right)+Q\left(x\right):x^5-10x^4-12x^3-2x^2+x-5$  

 $P\left(x\right)+Q\left(x\right):-x^5-8x^4-9x^3+3x^2+x+5$  

 $P\left(x\right):-13x^5+11x^4+4x^3-7x^2+x$  

 $P\left(x\right):-13x^5+11x^4+4x^3-7x^2+x-14$  

 $P\left(x\right):-13x^5+11x^4+4x^3-14$  

 $P\left(x\right)+Q\left(x\right):-12x^4+3x^3-4x^2-2$  

 $P\left(x\right)+Q\left(x\right):-12x^4+3x^3-18x-2$  

 $P\left(x\right)+Q\left(x\right):-12x^4+3x^3-2$  

 $P\left(x\right)-Q\left(x\right):-2x^4-11x^3-4x^2+18x+8$  

 $P\left(x\right)-Q\left(x\right):2x^4-11x^3-4x^2+18x+2$  

 $P\left(x\right)-Q\left(x\right):-2x^4-11x^3+8$  

 $Q\left(x\right)-P\left(x\right):2x^4+11x^3+4x^2-18x-8$  

 $Q\left(x\right)-P\left(x\right):2x^4-11x^3-4x^2+18x+2$  

 $Q\left(x\right)-P\left(x\right):-2x^4-11x^3+4x^2-18x-8$  

 $P\left(y\right)+Q\left(y\right):-10y^4-8y^3-6y^2+17$  

 $P\left(y\right)+Q\left(y\right):-10y^4-8y^3-6y^2+14y+17$  

 $P\left(y\right)+Q\left(y\right):-10y^4-8y^3-6y^2+14y$  

 $P\left(y\right)-Q\left(y\right):20y^4+2y^3+10y^2+14y+9$  

 $P\left(y\right)-Q\left(y\right):-20y^4+2y^3+10y^2+14y+9$  

 $P\left(y\right)-Q\left(y\right):20y^4+10y^2-14y-9$