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x²-c² = (x + c)(x - c). Kalau c saja, maka x² - c = (x + √c)(x - √c)
Pembahasan:
a.) x² - 49 = (x + 7)(x - 7)
b.) 4x-y² = (2√x - y)(2√x + y)
c.) x²-1 = (x + 1)(x - 1)
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