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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(7m)²+(10n)²+Amn. [ Let coefficient of mn is A]
(7m+10n)²–2.7m.10n +Amn
(7m+10n)²–140mn+Amn
If this equation is a perfect square then,
–140 mn = Amn
A= –140
49m²–140mn+100n²
Coefficient of mn is (–140)
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