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x² - y² = (x + y)(x - y)
sehingga
( 2a + 3 )² - ( a - 2 )²
= (2a + 3 + a - 2)(2a + 3 - a + 2)
= (3a + 1)(a + 5)
bisa diuraikan lagi menjadi
3a² + 15a + a + 5
= 3a² + 16a + 5