Question

Which is the simplified form of

Answer 1

1 1

------ + -------

r^7 s^12

Explanation:

r^(-7) + s^(-12) can be re-written as

1 1

------ + ------- by putting to use the rule:

r^7 s^12

1

x^(-a) = ----------

x^a

Answer 2

For this case, we must simplify the following expression:

`r ^ {- 7} + s ^ {- 12}`

By definition of power properties we have to:

`a ^ {- 1} = \frac {1} {a ^ 1} = \frac {1} {a}`

So, rewriting the expression we have:

`\frac {1} {r ^ 7} + \frac {1} {s ^ {12}}`

Answer:

`\frac {1} {r ^ 7} + \frac {1} {s ^ {12}}`

Option D