Question

Please answer!

Answer 1

Answer:

$-2x^6+7x^4+3x^3-3x^2+11x+20$

Step-by-step explanation:

$(-2x^3+x-5)(x^3-3x-4)\\ \\ =(-2x^3 \times x^3)+(-2x^3 \times-3x)+(-2x^3 \times -4)+(x \times x^3)+(x \times -3x)+(x \times -4)+(-5 \times x^3)+(-5 \times -3x)+(-5 \times -4)\\ \\ =-2x^6+6x^4+8x^3+x^4-3x^2-4x-5x^3+15x+20\\ \\ =-2x^6+7x^4+3x^3-3x^2+11x+20$