expand using algebraic identities (5+m/2)²
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(5+m/2)^2
=(5)^2 + (m/2)^2 + 2*5*m/2
=25 + m^2/4 + 5m
= 4 (m^2/4 + 5m + 25)
= 4m^2 +20m +100 Ans
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