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creativ13 [48]
3 years ago
8

I can't seem to figure out what numbers to use to solve this equation.

Mathematics
1 answer:
Kazeer [188]3 years ago
6 0
Hello!

The first thing you should notice is that the exponent will be less than 1, as raising 27 to any power greater than 1 will make it larger, and you're trying to figure out what makes it equal to 3, a number less than 27.

Raising a number to a fractional power is taking its nth root: 21^{1/3} is \sqrt[3]{21}, so you'll really need to take the nth root of 27 to get 3. To figure out which root, write the number in exponential form with a base of 3:

27^{x} = 3
3^{3x} = 3^{1}

Now, the bases are the same (they are both 3), so you can set the exponents equal to each other:

3x = 1

Divide both sides by 3 and you've isolated x:

x =  \frac{1}{3}

Answer:
27^{1/3} = 3
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