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x1x2 = 3
p+q = x1² + x2² = (x1+x2)² - 2 x1x2 = 16-6= 10
pq = x1². x2² = (x1x2)² = 9
PK baru x²- (p+q) x + (pq) =0
x² - 10x + 9 = 0