find the coefficient of mn, if
49m²+____mn+100n² is a perfect square trinomial.
plz guyz solve this very nicely, I wanna full explanation. plzzz. and I will mark u as brainliest positively but the answer should be correct.
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Answered by
1
Answer:
140
Step-by-step explanation:
PLEASE MARK AS BRAINLIEST!!!!
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