exam Maths Puzzle Numerical Ability

Can you assist me in solving this problem? I am a bit confused on how to set up the problem to get the answer.

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exam Other Question

Please solve using steps

Find the unknown in the equation log2 1056 = log2(2^a+5 plus 2^a)

The reason I wrote log2 1056 like that is becuase the 2 is supposed to be small
Given A = (1,2,3) and B = (2,1,3) then which is true:
A. 1 ⊆ A
B. A ⊂ A
C. A ⊂ B
D. A ⊆ B