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x^2%9; 9x^%6x+1; x^6y^3%x^3y^5; 4x^3y+4x^2y^2+x...

1:9-x^2-6x+9y^2 =9+9y^2-x^2-6x =9(1+y^2)-(x^2+6x) =9(y^2+1)-x(x+6) 2:x^2+8xy+16y^2+3x+3y+2 =x^2+2*x*4y+(4y)^2+3x+3y+2 =(x+4y)^2+3x+3y+2 =(x+4y)^2+3(x+y)+2

syms x a=x^4+3*x^3+9*x-18 b=x^5-4*x^3-18*x+7 c=x^7+6*x^5+9*x^3-5*x^2-2 d=x^9-8*x^7+6*x^5-4*x^4+6*x^2+3 e=collect(a*b*c*d)

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