(7a^2+2b^2)^2-(2b^2+7b^2)^2

(7a^2+2b^2)^2-(2b^2+7b^2)^2
(a^2+b^2+c^2)^2-4a^2b^2
(x+1)(x+2)(x+3)(x+4)-120
3x^2+4y^2+3z^2+8xy-8zy-10xz
x^2+2(a+b)x-(3a^2-10ab+3b^2)
6x^2+7xy+2y^2-8x-5y+2
6x^2-15y^2-6z^2-xy5xz+21yz
x^3+9x^2+26x+24
a^3+b^3+c^3-3abc
x^5+x+1
bc(b+c)+ca(c-a)-ab(a+b)
(b-c)^3+(c-a)^3+(a-b)^3
8x^3-(x-y)^3-(x+y)^3
x^3+(2a+1)x^2+(a^2+2a-1)x+a^2-1
a^2(b+c)+b^2(c+a)+c^2(a+b)-a^3-b^3-c^3-2abc