Explicación paso a paso:
[tex] {x}^{2} - 3x - 4 = 0 \\ (x - 4)(x + 1) = 0 \: \: (x - 4) = 0 \: \: o \: \: (x + 1) = 0 \\ \\ x = 4 \: \: o \: \: x = - 1[/tex]
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Explicación paso a paso:
[tex] {x}^{2} - 3x - 4 = 0 \\ (x - 4)(x + 1) = 0 \: \: (x - 4) = 0 \: \: o \: \: (x + 1) = 0 \\ \\ x = 4 \: \: o \: \: x = - 1[/tex]