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x₁+x₂ = -b/a = -m/2
x₁.x₂ = c/a = 16/2 = 8
x₁ = 2x₂
substitusi
x₁.x₂ = 8
2x₂.x₂ = 8
2x₂² = 8
x₂² = 4
x₂ = 2
maka
x₁ = 2.2 = 4
x₁+x₂ = -m/2
4+2 = -m/2
6 = -m/2
-m = 6.2
m = -12
semoga membantu ya :)