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2 votes
Without using log, Solve for x.


25^(2x+3) = 125^(x)

2 Answers

4 votes

Answer:

x=-6

Explanation:

The given exponential equation is;


25^(2x+3)=125^x

Rewrite both sides to base 5.


5^(2(2x+3))=5^(3x)

Equate the exponents;


2(2x+3)=3x

Expand:


4x+6=3x

Group like terms;


4x-3x=-6

Simplify


x=-6

User Dawrutowicz
by
7.9k points
1 vote

Answer:

x = -6

Explanation:

We recognize that 25 = 5^2 and also 125 = 5^3, thus we can write:


25^(2x+3)=125^x\\(5^2)^(2x+3)=(5^3)^x

Now we can use the property of exponents [
(a^x)^y=a^(xy)] to simplify it:


(5^2)^(2x+3)=(5^3)^x\\5^(2(2x+3))=5^(3x)\\5^(4x+6)=5^(3x)

We equate the exponents (since we have similar base) to find the value of x:

4x + 6 = 3x

4x - 3x = -6

x = -6

User Floorish
by
7.7k points

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