Show that : (3x + 7)² - 84x = (3x - 7)²
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☆ (3x + 7)² - 84x = (3x - 7)²
➥ (3x)² + 2 × 3x × 7 + (7)² - 84x
➥ 9x² + 42x + 49 - 84x
➥ 9x² - 42x + 49 = (3x - 7)²
➥ R.H.S.
☆ Hence proved.
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