votedcrown42183
Answered

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What is the exact value of x?

5 ⋅ 8^4x = 376




x=4log75.2/log8

x=4log8/log75.2

x=log75.2/4log8

x=log8/4log75.2

Sagot :

semsee45

Answer:

[tex]x=\dfrac{\log(75.2)}{4\log(8)}[/tex]

Step-by-step explanation:

[tex]\begin{aligned}5 \cdot 8^{4x} & =376\\8^{4x} & = \dfrac{376}{5}\\8^{4x} & =75.2\end{aligned}[/tex]

Taking logs of both sides:

[tex]\implies \log(8)^{4x}=\log(75.2)[/tex]

Using the power log rule [tex]\log_a(x)^n=n\log_a(x)[/tex] :

[tex]\implies 4x\log(8)=\log(75.2)[/tex]

Solving for x:

[tex]\begin{aligned}\implies 4x\log(8) & =\log(75.2)\\\\ 4x & =\dfrac{\log(75.2)}{\log(8)}\\\\x & =\dfrac{\log(75.2)}{4\log(8)}\\\end{aligned}[/tex]

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