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Δ = b² - 4ac = 0
Donde: a = a, b = -6, c = -3
Reemplazamos...
(-6)² - 4(a)(-3) = 0
36 + 12a = 0
36 = -12a
36/12 = -a
3 = -a
-3 = a
Asi que a = -3
Buen dia!