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akar2nya x1 & x2
diketahui x1 +x2 =3
x1+x2 = -b/a = -(-p)/2 =p/2 = 3
p = 6
x₁ + x₂ = - b/a
dimana:
a = 2 ; b = - p ; c = - 3
maka:
x₁ + x₂ = - b/a
3 = - (- p)/2
3 = p/2
p = 3 x 2
= 6