Question

${ \times }^{2 } - 1 = 8$
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Answer 1

Respuesta:

X^2-1 = 8

X^2-1+1 = 8+1

X^2 = 9

X^2-9 = 9-9

X^2-9 = 0

( X+3 )( X-3 ) = 0

X1 = -3 y X2 = 3

Explicación paso a paso: