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berarti (2.(-2)(3))^2 - (2.(2)(-4)) + (4.(-2)(-4)) - (5.(-2)(3)(-4))
= (-12)^2 - (-36) + (64) - 120
= 144 + 36 + 64 - 120
= 124
Trus d=5 itu buat apa ?