From the statement p, we deduced the statement r : “(x – 3) (x – 2) = 0” by
replacing the expression x2 – 5x + 6 in the statement p by another expression (x – 3)
(x – 2) which is equal to x2 – 5x + 6 (i)There arise two questions:
How does the expression (x – 3) (x – 2) is equal to the expression x2 – 5x + 6 (ii)
How can we replace an expression with another expression which is equal to
the former The first one is proved in earlier classes by factorization, i