show that (3x-7)² - 84x = (3x-7)²
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Answered by
23
Answer:
(3x+7)^2 - 84x
= 9x2+42x +49 -84 x
= 9x2 - 42x +49
=(3x-7)^2
Step-by-step explanation:
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Answered by
18
☆ (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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