Answer
$-\displaystyle \frac{9}{50}$
Work Step by Step
Write the prime factorization of the numerator ...
$9=3\times 3$
...and the denominator
$50=2\times 25$
$=2\times 5\times 5$
... and then divide both by all common factors...
... but there are no common factors, so the fraction is already in its simplest form
