Explicación paso a paso:
[tex] {a}^{2} - 5a - 14 = ( a + 2)(a - 2) \\ {a}^{2} - 5a - 14 = {a}^{2} - 4 \\ {a}^{2} - 5a - 14 - {a}^{2} + 4 = 0 \\ - 5a - 10 = 0 \\ - 5a = 0 + 10 \\ - 5a = 10 \\ a = \frac{10}{ - 5} = - 2[/tex]
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Explicación paso a paso:
[tex] {a}^{2} - 5a - 14 = ( a + 2)(a - 2) \\ {a}^{2} - 5a - 14 = {a}^{2} - 4 \\ {a}^{2} - 5a - 14 - {a}^{2} + 4 = 0 \\ - 5a - 10 = 0 \\ - 5a = 0 + 10 \\ - 5a = 10 \\ a = \frac{10}{ - 5} = - 2[/tex]