\(a,=4x\left(y-2\right)\\ b,=5xy\left(3x-y+2\right)\\ c,=\left(x+y\right)\left(5x-4\right)\\ d,=\left(x-4\right)^2\\ e,=\left(2x+1\right)^2\\ f,=\left(5x-3\right)\left(5x+3\right)\\ g,=\left(b+1\right)^3\\ h,=\left(x-2\right)^3\\ i,=\left(a-3\right)\left(a^2+3a+9\right)\)