usando la propiedad (x-y)(x+y) = x^2 - y^2
x^2 - 1 -x^2 -3x=-10
-1 -3x +10 =0
-3x+9=0
3x-9=0
3x=9
x=9/3
x=3
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usando la propiedad (x-y)(x+y) = x^2 - y^2
x^2 - 1 -x^2 -3x=-10
-1 -3x +10 =0
-3x+9=0
3x-9=0
3x=9
x=9/3
x=3