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2. 5x² + 13x - 6 = ( 5x - 2)(x + 3)
3.
........x² - 9.............(x - 3)(x + 3)
--------------------= -----------------
.....x² - 8x - 15.......x² - 8x - 15
4.
2x² - 23x + 21..( 2x - 21)(x - 1)
----------------- = --------------------
...x² - 49.......... ( x - 7)( x + 7)