(2x^2+5-5)(x^2-4x+1)
$$\\(2x^2+5-5)(x^2-4x+1)\\ =(2x^2)(x^2-4x+1)\\ =(2x^2\times x^2)-(2x^2\times 4x)+(2x^2\times 1)\\ =(2x^4)-(8x^3)+(2x^2)\\ =2x^4-8x^3+2x^2\\$$