A)(x-3)(x+3)(x²+9)-(x²+2)²+2(x+2)²=(x²-9)(x²+9)-x⁴-4x²-4+2x²+8x+8=
x⁴-81-x⁴-2x²+8x+4=-2x²+8x-77
b)(a-2)(a+2)(a²+4)²-(a²+1)²+2(a+1)²=
(a²-4)(a⁴+16a²+16)-(a⁴+2a²+1)+2(a²+2a+1)=
a⁶+16a⁴+16a²-4a⁴-64a²-64-a⁴-2a²-1+2a²+2a+1=
a⁶+15a⁴-48a²+2a=a(a⁴+15a³-48a+2)
