Question

Multitply
(x^8+2x)(x^8-2x)=

Answer 1

x^16 - 4x^2

Answer 2

(x^8+2x)(x^8-2x)

(x^8)(x^8)+(x^8)(-2x)+(2x)(x^8)+(2x)(-2x)

x^16-2x^9+2x^9-4x^2

x^16-4x^2


So (x^8+2x)(x^8-2x)=x^16-4x^2

Answer 3

(a-b)(a+b) = a^2-b^2
\[(x^8+2x)(x^8-2x)\]
that would be
(x^8)^2 - (2x)^2
x^16 - 4x^2
\[x ^{16}-4x^{2} \]