X=10 X=9 Los dos numeros
(X-10) (X-9)= X^2-9X-10X+90 Se aplica la conmutativa
= X^2-19X+90 es ecuacion cuadratica.
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X=10 X=9 Los dos numeros
(X-10) (X-9)= X^2-9X-10X+90 Se aplica la conmutativa
= X^2-19X+90 es ecuacion cuadratica.