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4x²-9
=2x² -3x -9 - (4x²-9)
= 2x² -3x -9 -4x² + 9
= -2x² - 3x
= x ( -2x -3)
2x+3 =x
3= x-2x
3=-x
-3 =x
2-3x-9 per 4-9
=> (2x+3) (x-3) per (2x-3) (2x+3) lalu kita bagi/ coret yg sama.
=> (x-3) per (2x-3). semoga membantu.