\(=\left(x-4\right)\left(x-2\right)\left(x-5\right)\left(x-7\right)-72\)
\(=\left(x^2-9x+20\right)\left(x^2-9x+14\right)-72\)
\(=\left(x^2-9x\right)^2+34\left(x^2-9x\right)+208\)
\(=\left(x^2-9x+8\right)\left(x^2-9x+26\right)\)
\(=\left(x-1\right)\left(x-8\right)\left(x^2-9x+26\right)\)