Pasos:
[tex]x^{2} -2x-15[/tex]
Factorizar la expresion:
= [tex](x^{2}+3x)+(-5x-15)[/tex]
Factorizar [tex]x ,de,x^{2} +3x[/tex] : x ( x+3 )
Factorizar: -5 [tex]de[/tex] -5x -15: -5 ( x+3 )
= x ( x+3 ) -5 ( x+3 )
Factorizar el termino comun x+3
= [tex](x+3)(x-5)[/tex]
