Answer :

(2p + q + 5)^{2} =(2p)^{2} +(q)^{2} +(5)^{2} + [ 2 ×(2p)×(q)] + [ 2 ×(q)×(5)] + [ 2 ×(2p)×(5)]

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

Here a = 2p, b = q, c = 5 }

= 4p^{2} + q^{2} + 25 + [ 4pq ] + [ 10q ] + [ 20p ]

= 4p^{2} + q^{2} + 25 + 4pq + 10q + 20p

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