Question

$y = (x - 1)(x + 3) and hencesolvex$
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Answer 1

$(x - 1)(x + 3) = y \\ = > {x}^{2} + 3x - x - 3 = y \\ = > {x}^{2} - 2x - 3 = y \\ = > {x}^{2} - 2x = y + 3$