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ingat a² - b² = (a+b)(a-b)
jadi = (5x)²-(7y)² = (5x + 7y) (5x - 7y)
b. 2x² - 5x - 12 / 4x² - 9 = (2x-3)(x+4) / (2x)²-3²
= (2x-3)(x+4) / (2x + 3)(2x-3)
= x+4 / x+3