Answer :

(m + 2n + 3r)^{2} =(m)^{2} +(2n)^{2} +(3r)^{2} + [ 2 ×(m)× (2n)] + [ 2 ×(2n)×(3r)] + [ 2 ×(m)×(3r)]

{ ∵(a + b +c)^{2} = a^{2} + b^{2} + c^{2} + 2ab + 2bc + 2ac }

= m^{2} + 4n^{2} + 9r^{2} + [ 4mn ] + [ 12nr ] + [6mr ]

= m^{2} + 4n^{2} + 9r^{2} + 4mn + 12nr + 6mr

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