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(x-2) (x+4) = 0
x = 2 (ALFA) dan x = -4 (BETA)
1/alfa + 1/beta =
1/2 - 1/4 = ..... + berubah menjadi - karena beta bernilai -
2/4 - 1/4 = 1/4
alfa . 2beta + alfa . beta^2
2 . 2(-4) + 2 . (-4)^2
-16 + 32 = 16