(3x + 7)²-84x= (3x - 7)²
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Answered by
9
Step-by-step explanation:
9x2+49+21x-84x=9x2+49-21x
-63x=-21x
-63x+21x=0
-42x=0
x=0
I hope it may help you
Answered by
35
☆ (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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