Dos números que multiplicados den -18 y sumados den -1?
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x²-x-18=
![\frac{-(-1) \frac{+}{-} \sqrt{(-1^{2})-4(-18)(1) } }{2(1)[tex] \frac{1 \frac{+}{-} = \sqrt{1+72} }{2}](https://tex.z-dn.net/?f=+%5Cfrac%7B-%28-1%29+%5Cfrac%7B%2B%7D%7B-%7D+%5Csqrt%7B%28-1%5E%7B2%7D%29-4%28-18%29%281%29+%7D+++%7D%7B2%281%29%5Btex%5D+%5Cfrac%7B1+%5Cfrac%7B%2B%7D%7B-%7D+%3D%C2%A0%5Csqrt%7B1%2B72%7D++%7D%7B2%7D+ "\frac{-(-1) \frac{+}{-} \sqrt{(-1^{2})-4(-18)(1) } }{2(1)[tex] \frac{1 \frac{+}{-} = \sqrt{1+72} }{2}")
} [/tex]=
=
= 
= 4.772
= 
=3.772
-4.772*3.772= -18
3.772-4.772=-1
-4.772*3.772= -18
3.772-4.772=-1
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