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Question Number 54875 by shaddie last updated on 13/Feb/19
Given that((log(3x+1)^(2x−1) )/(log(3x+1)))=5,find the value of x.
$$\mathrm{Given}\:\mathrm{that}\frac{\mathrm{log}\left(\mathrm{3x}+\mathrm{1}\right)^{\mathrm{2x}−\mathrm{1}} }{\mathrm{log}\left(\mathrm{3x}+\mathrm{1}\right)}=\mathrm{5},\mathrm{find}\:\mathrm{the}\:\mathrm{value}\:\mathrm{of}\:\mathrm{x}. \\ $$
Answered by kaivan.ahmadi last updated on 14/Feb/19
log(3x+1)^(2x−1) =log(3x+1)^5 ⇒  (3x+1)^(2x−1) =(3x+1)^5 ⇒2x−1=5⇒  x=3
$$\mathrm{log}\left(\mathrm{3x}+\mathrm{1}\right)^{\mathrm{2x}−\mathrm{1}} =\mathrm{log}\left(\mathrm{3x}+\mathrm{1}\right)^{\mathrm{5}} \Rightarrow \\ $$$$\left(\mathrm{3x}+\mathrm{1}\right)^{\mathrm{2x}−\mathrm{1}} =\left(\mathrm{3x}+\mathrm{1}\right)^{\mathrm{5}} \Rightarrow\mathrm{2x}−\mathrm{1}=\mathrm{5}\Rightarrow \\ $$$$\mathrm{x}=\mathrm{3} \\ $$
Answered by Otchere Abdullai last updated on 14/Feb/19
solution  ((log(3x+1)^(2x−1) )/(log(3x+1)))=5  ⇒(((2x−1)log(3x+1))/(log(3x+1)))=5  ⇒2x−1=5  ⇒2x=5+1  ⇒2x=6  ⇒((2x)/2)=(6/2)  ⇒x=3
$${solution} \\ $$$$\frac{{log}\left(\mathrm{3}{x}+\mathrm{1}\right)^{\mathrm{2}{x}−\mathrm{1}} }{{log}\left(\mathrm{3}{x}+\mathrm{1}\right)}=\mathrm{5} \\ $$$$\Rightarrow\frac{\left(\mathrm{2}{x}−\mathrm{1}\right){log}\left(\mathrm{3}{x}+\mathrm{1}\right)}{{log}\left(\mathrm{3}{x}+\mathrm{1}\right)}=\mathrm{5} \\ $$$$\Rightarrow\mathrm{2}{x}−\mathrm{1}=\mathrm{5} \\ $$$$\Rightarrow\mathrm{2}{x}=\mathrm{5}+\mathrm{1} \\ $$$$\Rightarrow\mathrm{2}{x}=\mathrm{6} \\ $$$$\Rightarrow\frac{\mathrm{2}{x}}{\mathrm{2}}=\frac{\mathrm{6}}{\mathrm{2}} \\ $$$$\Rightarrow{x}=\mathrm{3} \\ $$

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