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3p=3 3q=-6
(x-3)(x+6)=x^2 +3x-18=0
p+q= -b/a = -1
p.q= c/a = 2
x1+x2 = 3p+3q = 3(p+q) = 3(-1) = -3
x1.x2 = 3p.3q = 3(p.q) = 3(2) = 6
PK Baru :
x^2+(x1+x2)x+(x1.x2) = 0
x^2+(-3)x+6 = 0
x^2-3x+6=0