# How to simplify this scientific notation?

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

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

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