\(1.\left(\sqrt{x}+1\right)\left(\sqrt{x}-2\right)\)
\(=\sqrt{x}\left(\sqrt{x}-2\right)+1\left(\sqrt{x}-2\right)\)
\(=x-2\sqrt{x}+\sqrt{x}-2\)
\(=x-\sqrt{x}-2\)
\(2.\left(x+4\right)\left(x-2\right)-\left(x-3\right)^2\)
\(=x\left(x-2\right)+4\left(x-2\right)-\left(x^2-6x+9\right)\)
\(=x^2-2x+4x-8-x^2+6x-9\)
\(=8x-17\)