# Thread: Exponent, to a negative exponent. Stroud problem.

1. ## Exponent, to a negative exponent. Stroud problem.

Hi,

I'm a little confused with a problem (very!) early on in the 5th edition of Stroud's Engineering Mathematics.

F1 (pg. 69), #14c

Write each of the following as a number raised to a power:

The answer given is:

Naively, I thought:

Although I guess would be appropriate according to the wording of the question.

Clearly I'm missing something fundamental, can someone please point me in the right direction?

2. I would say that, while your notation of

$\displaystyle (-4.-4.-4.-4)^{-4}$ isn't quite kosher, the idea is correct. I would write it as $\displaystyle ((-4)(-4)(-4)(-4))^{-4}.$

In any case, your answer is correct. The answer of -4 is clearly wrong.

3. Argh, thank you. I guess I should have more confidence in myself . Thanks for the notation tips too, understood.

Many thanks!

4. You're welcome!