Question

A number to the 12th power divided by the same number to the 9th power equals 216. What is the number?

Answer 1

Answer:

The given such number is 6.

Step-by-step explanation:

Let the given such number  = m

Now, according to the question, the given expression is:

$\frac{(m^{12}) }{(m^{9}) } = 216$

By the LAW OF EXPONENTS:

$\frac{x^a}{x^b} = x^{(a-b)}$

⇒Here $\frac{m^{12}}{m^9} = m^{(12-9)} = m^{(3)}$

or, the given expression becomes $m^3 = 216\\\implies m = \sqrt[3]{216} = 6$

or, m  = 6

Hence, the given such number is 6.