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penjumlahan akar = x1 + x2 + 2 + 2 = 3
perkalian akar = (x1 + 2)(x2 + 2) = x1x2 + 2(x1+x2) + 4
= 5 + 2(-1) + 4
= 7
maka
x² - (3)x + 7 = 0
x² - 3x + 7 = 0
^_^