pls help with following questions! im really stuck... and pls explain with full setting out,,, im w8ing for a genius to save me!!!

(s+1)(3s+2)

(d-2)(3d+5)

(a+3)(4-1)

(a+b)(a-b)

(3s-t)^2

(h-5)(2h+4)

(5-f)^2

(1+2x)(4+3x)

(h+3)(3h-4)

(1+7k)(5-k)

(3s-5t)(4s-2t)

(8-5r)(1-r)

(2y-7z)(5y-4z)

(2d-3c)(2d+3c)

(t+7)^2

(3+y)^2

(a+2b)^2

(2e+3f)^2

(p-5)^2

(x-y)^2

(d-2e)^2

(3p-5q)^2

I'm Sorry for the huge workload

thanks SO MUCH