Question

(x + 8)(x - 1) =

(x - 5)(x + 5) =

Answer 1

$(x + 8)(x - 1) = \\ \\ {x}^{2} - x + 8x - 8 \\ \\ {x}^{2} + 7x - 8 \\ \\ (x + 8) = 0 \: \: entonces \: \: x = - 8 \\ \\ (x - 1) = 0 \: \: entonces \: x = 1$

$(x - 5)(x + 5) \\ {x}^{2} + 5x - 5x - 25 = 0 \\ {x}^{2} - 25 = 0 \\ {x}^{2} = 25 \\ x = - 5 \\ x = + 5$