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2. x + 2 per (x^2 + 8x + 12) = x+2 per (x+6)(x+2) --> difaktorkan
= 1 per (x+6)
3. x^2 + 14xy + 9y^2 per (x^2 + 2xy - 35y^2) =
4. x^2 - 3x + 2 per (2-x) = (x-1)(x-2) per (2-x)
= (1-x)(2-x) per (2-x)
= 1-x
pakai tanda kurung soalnya supaya ga bingung