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x²-20+91
x -7
x -13
entonces seria asi
(x-7)(x-13)
y eso seria la ecuacion ya descompuesta
Factorizamos a "20":
x²-7x-13x+91= 0
Factorizamos a la vez a "x" y a "13":
x(x-7)-13(x-7)= 0
Factorizamos a "x-7":
= (x-13)(x-7)
x¹= 13
x²= 7
Saludos!