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b² - 4ac = 0
(-k)² = 4(1)(36
k² = 144
k = √144
k = 12
a=1; b=-k; c=36
Si las raíces son iguales la discriminante debe ser igual a cero
b²-4ac=0
(-k)²-4(1)(36)=0
k²-144=0
k²-12²=0
(k+12)(k-12)=0
k+12=0 ∨ k-12=0
k=-12 k=12