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= (x + 1)/(x + 4)
12) 25a² - 16b²
= (5a)² - (4b)²
= (5a + 4b)(5a - 4b)
note: a² - b² = (a + b)(a - b)
13) x² - 19x - 20
= x² - 20x + x - 20
= x(x - 20) + 1(x - 20)
= (x + 1)(x - 20)
nomor 12
nomor 13
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