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n²+n-6=0
(n+3)(n-2)=0
n=-3 y n=2
x²- 10x+25=0
(x-5)(x-5)=0
x=5 solo esta ya que los dos son iguales
x²=-6x-9
x²+6x+9=0
(x+3)(x+3)=0
x=-3 Igual que antes, solo hay una
12x+36=-x²
x²+12x+36=0
(x+6)(x+6)=0
x=-6
Espero que hayas entendido, Suerte =D