Answer to Question #15487 in Algebra for Alisha
y = ln(ax^3)+b and y = ((x^4)+(3x^3))^7
second is (x^4+3x^3)^7=(x^3(x+3))^7=x^21(x+3)^7 (here we used that (ab)^c=(a^c)(b^c) and (a^b)^c=a^(bc))
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