\(A=\left(x-2\right)\left(x+2\right)\left(x^2-10\right)-72=\left(x^2-4\right)\left(x^2-10\right)-72=x^4-14x^2+40-72\)
\(A=x^4-14x^2-32=x^4+2x^2-16x^2-32=x^2\left(x^2+2\right)-16\left(x^2+2\right)\)
\(A=\left(x^2+2\right)\left(x^2-16\right)=\left(x-4\right)\left(x+4\right)\left(x^2+2\right)\)