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x1 . x2 = c/a = 3
akar baru
(x1 + 2) + (x2 + 2) = x1 + x2 + 4 = -4 + 4 = 0
(x1 + 2) (x2 +2) = x1x2 + 2(x1+x2) + 4 = 3 + 2(-4) + 4
= 7 - 8 = -1
persamaannya
x² - 0x + (-1) = 0
x² - 1 = 0