The first one is proved in earlier classes by factorization, i e ,
x2 – 5x + 6 = x2 – 3x – 2x + 6 = x (x – 3) –2 (x – 3) = (x – 3) (x – 2) The second one is by valid form of argumentation (rules of logic)
Next this statement r becomes premises or given and deduce the statement s
“ x – 3 = 0 or x – 2 = 0” and the reasons are given in the brackets