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(1) (3x + 7)? - 84x = (3x – 7)
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Step-by-step explanation:
The given equation is
(3x + 7)2 = (3x - 7)2 + 84x
(9x2 + 49 + 42x) = (9x2 + 49 - 42x) + 84x
9x2 + 49 + 42x = 9x2 + 49 - 42x + 84x
9x2 + 49 + 42x = 9x2 + 49 + 42x
9x2 + 49 + 42x - 9x2 - 49 - 42x = 0
simplify the equation then
0 = 0
hence proved
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