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x^3 - 5x^2 + 4x + 10 = 0
akar akarnya A,B, C
A+B +C = -b/a = -4
AB + AC + BC = c/a = 4
A²+B²+C² =(A+B+C)² - 2(AB+AC+BC) =(-4)²- 2(4)= 16 - 8 = 8