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Yang nomor 3, aku bingung antara N atau H. Tapi aku tulis H.semoga membantu :)
1) x^2 + 9x + 20 = ( x + 5 ) ( x + 4 )
2) a^2 - 7a + 12 = ( a - 4 ) ( a - 3 )
3) h^2 - 4h + 4 = ( h -2 ) ( h - 2)
4) x^2 - 2x- 15 = ( x - 5) ( x + 3)
5) n^2 + 3n - 40 = ( n + 8 ) ( n - 5)