35
25
2m−u5m+u
m−2um+5u
Correct answer is A
(2m−u)2−(m−2u)25m2−5u2
= 2m−u+m−2u)(2m−u−m+2u)5(m+u)(m−u)
= 3(m−u)(m+u)5(m+u)(m−u)
= 35
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