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Let the unknown term be a.
Finding square root of large numbers can be difficult.Hence we can write it in terms of its prime factors.
1296 can be written as $$2^{4} \times 3^{4}$$.
$$\sqrt{1296}$$=$$\sqrt{2^{4} \times 3^{4}}$$=$$2^{2}\times3^{2}$$
$$\sqrt{a}$$ = 36 + 12 =48
a= $$48^{2}$$.
Hence Option B is the correct answer.
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