Mathematics Stack Exchange is a question and answer site for people studying math at any level and professionals in related fields. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

How to find the answer of the following question I missed the class in which it was taught how to solve this equation so step by step solution will be appreciated. Thanks

$$\large \frac{(9 \cdot 10^{9}) (1.6 \cdot 10^{-19})^{2}}{(6.7 \cdot 10^{-11})(9.1 \cdot 10^{-31})(1.7 \cdot 10^{-27})}$$

share|cite|improve this question
There is no equation. Do you want us to evaluate the term? I can't parse the term, is everything after the ”/” in the denominator? – k.stm Jan 22 '13 at 16:04
is it supposed to be $9x10^9$ or $9 \cdot 10^9$? – Bob Jan 22 '13 at 16:10
@Bob I really think those $x$es are $\times$es, here, denoting multiplication. This just isn't an equation. Even it was an $x$, it doesn't matter because they cancel each other out: three in the nominator, three in the denominator. – k.stm Jan 22 '13 at 16:21
@K.Stm. Well judging on his topic title, I think TS just wants to simplify the fraction. Probably calls it an equation because he/she doesnt know how to call this. – Bob Jan 22 '13 at 16:25

Hint 1: $$\frac{x^n}{x^2}=x^{n-2}$$ $$x^n \cdot x^2=x^{n+2}$$

Hint 2: All coefficients in denominator can be multiplied (same for numerator)

share|cite|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.