Question

Efectuati :
$(x-2)(x+2)(x^{2} +4)-( x^{2} +1)^{2}+2(x+1)^{2}$

Answer 1

(x-2)(x+2)(x²+4)-(x²+1)²+2(x+1)²=
=(x²-4)(x²+4)-(x⁴+2x²+1)+2(x²+2x+1)=
=x⁴-16-x⁴-2x²-1+2x²+4x+2=
=-16-1+4x+2=
=4x-15