b)loga 5a^4 <---- loga a is subscript.
1st: log2[ x^2 - 9/x^3]^3 = 3log2[x^2] - (log29 - log2[x^3] ] = 3 (2logx - log9 + 3logx) = 3(5logx - log9) = 15logx - 5log9 15log2x - 5log29 you try the second
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