Question 611887
={{{(x+5)(x^3+5x^2+2x-4)}}}
={{{x(x^3+5x^2+2x-4)+5(x^3+5x^2+2x-4)}}}
={{{x^4+5x^3+2x^2-4x+5x^3+25x^2+10x-20)}}}
={{{x^4+5x^3+5x^3+2x^2+25x^2-4x+10x-20)}}}
={{{x^4+10x^3+27x^2+6x-20)}}}