a1 + a2 + a3 (Question asks us to answer the result in terms of a1) where a2 = 2a1 + 3 and a3 = 4a2 + 32.
= a1 + (2a1 + 3) + (4a2 + 32)
= 3a1 + 4(2a1 + 3) + 35
= 3a1 + 8a1 + 12 + 35
= 11a1 + 37
Hope this helps.
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