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(=) (x -(-5))(x - 3)
(=) (x + 5)(x - 3)
(=) x² - 3x + 5x -15
= x² + 2x - 15
X² - (-5 + 3)X + (-5 · 3) = 0
X² - (-2)X + (-15) = 0
X + 2X - 15 = 0