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(3x-2)(x+1) = 0
3x-2 = 0 atau x+1 = 0
3x = 2 atau x = -1
x = 2/3
maka
9(x1 + x2)² - 6 x1 x2 =
9(2/3 - 1)² - 6 (2/3) (-1) =
9(1/9) + 4 =
1 + 4 =
5