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31. Given [tex]$83,349 = 7^x \cdot 3^y$[/tex], what is the value of [tex]$x + y$[/tex]?

A. 6
B. 8
C. 12
D. 15


Sagot :

To solve the equation [tex]\( 83,349 = 7^x \cdot 3^y \)[/tex], we need to determine the values of [tex]\( x \)[/tex] and [tex]\( y \)[/tex] such that [tex]\( 7^x \)[/tex] and [tex]\( 3^y \)[/tex] are the prime factors of 83,349.

Let's begin by factorizing 83,349 into its prime components.

By examining the factors of 83,349, we find:

1. Prime factorization:

[tex]\[ 83,349 = 7^3 \cdot 3^5 \][/tex]

From this prime factorization, we can see that:

- The exponent [tex]\( x \)[/tex] corresponding to the prime factor 7 is [tex]\( 3 \)[/tex]
- The exponent [tex]\( y \)[/tex] corresponding to the prime factor 3 is [tex]\( 5 \)[/tex]

Now, we need to find the sum of [tex]\( x \)[/tex] and [tex]\( y \)[/tex]:

[tex]\[ x + y = 3 + 5 \][/tex]

Finally, the sum of [tex]\( x \)[/tex] and [tex]\( y \)[/tex] is:

[tex]\[ x + y = 8 \][/tex]

So, the value of [tex]\( x + y \)[/tex] is [tex]\( \boxed{8} \)[/tex].
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