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x₁ + x₂ = 0
2a/(1) = 0
a = 0
1) Berlawanan tanda berarti
x1 = - x2
x1 + x2 = 0
-b/a = 0
-(-2a)/1 = 0
2a = 0 , maka a = 0
2) Saling berkebalikan berarti
x1 = 1/x2
x1x2 = 1
c/a = 1
(a+2)/1 = 1
a + 2 = 1 maka a = -1