Question

x^4+64

Answer 1

\(=x^4+16x^2+64-16x^2=\left(x^2+8\right)^2-\left(4x\right)^2=\left(x^2-4x+8\right)\left(x^2+4x+8\right)\)

Answer 2

\(=x^4+16x^2+64-16x^2\)

\(=\left(x^2+8-4x\right)\left(x^2+8+4x\right)\)