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3x dikali 3x = 9x²
3x dikali -2 = - 6x
2 dikali 3x = 6x
2 dikali - 2 = - 4
9x² - 6x + 6x - 4
9x² - 4
= 9x^2 - 6x + 6x - 4
= 9x^2 - 4