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x2 dimisalkan q
p+q = -b/a = 5
p.q = c/a = -1
x1+x2 = (2p+1) + (2q+1) = 2(p+q) + 2 = 2(5) + 2 = 12
x1.x2 = (2p+1)(2q+1) = 4(p.q)+2(p+q)+1 = 4(-1)+2(5)+1 = 7
PK Baru = x²-(x1+x2)x+(x1.x2) = x²-12x+7