please. answer the question
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Step-by-step explanation:
(3x+7)²-84x
9x²+42x+49-84x
9x²-42x+49
(3x+7)²
(4m/3-3n/4)²+2mn
16m²/9-2mn-9n/16 +2mn
16m²/9-9n/16
Answer:
The above answer is the correct answer.
Please mark it as brainliest, (not mine)