List three different ways to write 5^11 as the product of two powers. Explain why all three of your expressions are equal to 5^11
In multiplying quantities of the same base, the product is simply the base raised to a power that is the sum of the individual powers of the factors. That is, \((a^n)(a^m)= a^{n+m}\)
The term \(5^{11}\) can be expressed as the product of two factors with the same base (which is five) and whose powers add up to 11. Three examples are:
\((5^1)(5^{10}) = 5^{1+10} = 5^{11} \\ (5^5)(5^6) = 5^{5+6} = 5^{11} \\
(5^8)(5^3) = 5^{8+3} = 5^{11}\)
By using properties of powers, we can find:
\(5^{11} = 5^9*5^2\\\\5^{11} = 5^8*5^3\\\\5^{11} = 5^7*5^4\)
Here we need to remember the powers property:
\(a^n*a^b = a^{n + b}\)
So we can rewrite:
\(5^{11} = 5^n*5^m\)
Always that n + m = 11.
With that in mind, 3 possible forms of writing that expression is:
\(5^{11} = 5^9*5^2\\\\\\5^{11} = 5^8*5^3\\\\5^{11} = 5^7*5^4\)
In all of these cases, the sum of the two exponents in the right side is 11.
If you want to learn more about powers:
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