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Select the correct answer.

Simplify the expression [tex]$5^3 \times 5^{-5}$[/tex]

A. [tex]$-5^2$[/tex]

B. [tex]$\frac{1}{5^2}$[/tex]

C. [tex][tex]$5^2$[/tex][/tex]

D. [tex]$\frac{1}{5}$[/tex]


Sagot :

Let's simplify the expression [tex]\(5^3 \times 5^{-5}\)[/tex].

1. Apply the properties of exponents: One of the properties of exponents is that [tex]\(a^m \times a^n = a^{m+n}\)[/tex]. In this case, we apply this property to combine the exponents:
[tex]\[ 5^3 \times 5^{-5} = 5^{3 + (-5)} \][/tex]

2. Simplify the exponent: Add the exponents [tex]\(3\)[/tex] and [tex]\(-5\)[/tex]:
[tex]\[ 3 + (-5) = -2 \][/tex]

3. Expression with a single exponent: Now the expression simplifies to:
[tex]\[ 5^{-2} \][/tex]

4. Interpret the negative exponent: Recall that a negative exponent signifies the reciprocal of the base raised to the absolute value of the exponent:
[tex]\[ 5^{-2} = \frac{1}{5^2} \][/tex]

5. Calculate the value of [tex]\(5^2\)[/tex]:
[tex]\[ 5^2 = 25 \][/tex]

6. Final expression: So, the expression [tex]\(5^{-2}\)[/tex] can be written as:
[tex]\[ 5^{-2} = \frac{1}{25} \][/tex]

Therefore, the simplified form of the expression [tex]\(5^3 \times 5^{-5}\)[/tex] is [tex]\(\frac{1}{5^2}\)[/tex].

So, the correct answer is:

B. [tex]\(\frac{1}{5^2}\)[/tex]