Questions: Simplify the logarithm 4 log5 x + 3 log5 y - 2 log5 z

Simplify the logarithm 4 log5 x + 3 log5 y - 2 log5 z
Transcript text: Simplify the logarithm $4 \log _{5} x+3 \log _{5} y-2 \log _{5} z$
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Solution

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Solution Steps

To simplify the given logarithmic expression, we can use the properties of logarithms. Specifically, we can use the power rule, which states that alogbc=logb(ca) a \log_b c = \log_b (c^a) , and the product and quotient rules, which state that logbm+logbn=logb(mn) \log_b m + \log_b n = \log_b (mn) and logbmlogbn=logb(mn) \log_b m - \log_b n = \log_b \left(\frac{m}{n}\right) , respectively. Applying these rules will allow us to combine the terms into a single logarithm.

Step 1: Apply the Power Rule of Logarithms

The given expression is 4log5x+3log5y2log5z4 \log_{5} x + 3 \log_{5} y - 2 \log_{5} z. Using the power rule of logarithms, which states that alogbc=logb(ca)a \log_b c = \log_b (c^a), we can rewrite each term as:

  • 4log5x=log5(x4)4 \log_{5} x = \log_{5} (x^4)
  • 3log5y=log5(y3)3 \log_{5} y = \log_{5} (y^3)
  • 2log5z=log5(z2)-2 \log_{5} z = \log_{5} (z^{-2})
Step 2: Apply the Product and Quotient Rules of Logarithms

Next, we use the product rule logbm+logbn=logb(mn)\log_b m + \log_b n = \log_b (mn) and the quotient rule logbmlogbn=logb(mn)\log_b m - \log_b n = \log_b \left(\frac{m}{n}\right) to combine the terms: log5(x4)+log5(y3)log5(z2)=log5(x4y3z2) \log_{5} (x^4) + \log_{5} (y^3) - \log_{5} (z^{-2}) = \log_{5} \left(\frac{x^4 \cdot y^3}{z^2}\right)

Final Answer

The simplified expression is: log5(x4y3z2) \boxed{\log_{5} \left(\frac{x^4 y^3}{z^2}\right)}

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