Đáp án:
(3x - 5)² - (5x + 2)²
= [3x − 5 − (5x + 2)][3x − 5 + (5x + 2)]
= (3x − 5 − 5x − 2)(3x − 5 + 5x + 2)
= [(3x - 5x) + (-5 - 2)] . [(3x + 5x) + (-5 + 2)]
= [−2x + (−7)] . [(8x + (−3)]
= (−2x − 7)(8x − 3)
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