Answer:
{8^¾+2³)^½
√{2^9/4+2³}
√{2³(2^3/4+1)}
2√{2×2^3/4+2}
2√{2^(1+3)/4+2)
2√2^4/4+2}
2√{2+2}
2√4
2×2
4 is your answer
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