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x ² + xy - 12y²
--------------------
....x² - 16y²
( x - 4y)(x + 3y)
=---------------------
(x - 4y)( x + 4y)
(x + 3y)
=---------
(x + 4y)
2.
x² - 5x + 6
------------
2x² + x - 10
( x - 3)(x -2)
=-------------
(2x - 5)(x + 3)
3.
m² - 3m + 2
---------------
.....2 - m
(m - 2)(m -1)
=--------------
....(2 - m)
= - ( m -1)
= 1 - m